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PDFdefault ads. How to remove? (Uninstall guide)

removal by Julie Splinters - - | Type: Adware
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PDFdefault virus and its main features:

PDFdefault virus is a typical representative of the adware virus category which is growing more popular every day. The main features of this viruses are unpredictable redirects, never-ending ads, and data tracking. These activities are far from being respectable, not to mention that they can be dangerous as well. Nevertheless, the creators of PDFdefault application present their questionable creation as a reliable assistant for improving users’ browsing experience. And, sadly, many of the computer users fall for such false advertising. However, direct downloads take up the smallest percentage of the distribution techniques used for spreading this program around. More commonly, potentially unwanted programs like PDFdefault are brought into the users’ computers by other freeware and shareware applications. That is why when these programs infiltrate the system; this whole process usually goes unnoticed, and the virus is able to carry out its activities in the background of the system. What can suggest if you have not been exposed to PDFdefault hijack are several typical signs that we are going to discuss later in the article. However, in case you are sure about the source of the infection already, we suggest taking precautions to prevent the further damage. Employ a reliable antivirus software, such as a Reimage to remove PDFdefault from the computer.

An illustration of the PDFdefault ads

One of the suspicious activities this application is known for is extensive advertising. PDFdefault ads may appear anytime and anywhere because they are designed to bring as much profit to the adware creators as possible. Keep in mind that these ads will be labeled something along the lines of “Ads by PDFdefault” or “Powered by PDFdefault“. Keep away from advertisements, pop-up ads or banners labeled like this, no matter how inviting they may seem. Also, beware of random text links that might appear on your favorite news site or elsewhere. All these insecure links can lead you to some random PDFdefault redirect, after which you might end up on infectious third-party websites. That is why we suggest refraining from browsing until you take care of the PDFdefault removal.

How can PDFdefault hijack your PC?

PDFdefault is a typical adware virus also because it is distributed using the most popular deceptive marketing technique, called “bundling.” So, there is no surprise that most PC users claim that this program has appeared on their computers without specific permission. In fact, there is no mystery in that: the virus was probably downloaded along with other freeware and shareware applications, such as PDF creators, download managers or video streaming software. So, when installing free software in the future, make sure you select “Advanced” or “Custom” installation mode to stop undesirable programs like PDFdefault entering your computer. By no means should you mindlessly keep clicking “next” throughout the installation steps because you just might miss the chance to opt out a potentially malicious program from installing on your computer.

PDFdefault removal from the infected computer:

Numerous ads and sponsored links are the most obvious signs of the PDFdefault virus infection. These ads can be intrusive, get in your way when browsing online, while the program itself might be completely uses. This browsing optimizer is a waste of computer’s space and your time, so why wait with the PDFdefault removal? It is recommended that you get rid of the program using professional and acknowledges antivirus software, but if you have no possibilities to do that, you can use freely downloadable software or follow the manual instructions provided at the end of this article. Since the program is not a severe type of virus, with a little bit of effort you will successfully remove PDFdefault from your computer.

You can remove PDFdefault automatically with a help of one of these programs: Reimage, Plumbytes Anti-MalwareWebroot SecureAnywhere AntiVirus, Malwarebytes Anti Malware. We recommend these applications because they can easily delete potentially unwanted programs and viruses with all their files and registry entries that are related to them.

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Compatible with Microsoft Windows Compatible with OS X
What to do if failed?
If you failed to remove infection using Reimage, submit a question to our support team and provide as much details as possible.
Reimage is recommended to uninstall PDFdefault ads. Free scanner allows you to check whether your PC is infected or not. If you need to remove malware, you have to purchase the licensed version of Reimage malware removal tool.

More information about this program can be found in Reimage review.

More information about this program can be found in Reimage review.

Manual PDFdefault ads Removal Guide:

WindowsMac OS XInternet ExplorerMicrosoft EdgeFirefoxGoogle ChromeSafari

Remove PDFdefault from Windows systems

Reimage is a tool to detect malware.
You need to purchase Full version to remove infections.
More information about Reimage.

  1. Click Start Control Panel Programs and Features (if you are Windows XP user, click on Add/Remove Programs). Click 'Start -> Control Panel -> Programs and Features' (if you are 'Windows XP' user, click on 'Add/Remove Programs').
  2. If you are Windows 10 / Windows 8 user, then right-click in the lower left corner of the screen. Once Quick Access Menu shows up, select Control Panel and Uninstall a Program. If you are 'Windows 10 / Windows 8' user, then right-click in the lower left corner of the screen. Once 'Quick Access Menu' shows up, select 'Control Panel' and 'Uninstall a Program'.
  3. Uninstall PDFdefault and related programs
    Here, look for PDFdefault or any other recently installed suspicious programs.
  4. Uninstall them and click OK to save these changes. Right click on each of suspicious entries and select 'Uninstall'
WindowsMac OS XInternet ExplorerMicrosoft EdgeFirefoxGoogle ChromeSafari

Remove PDFdefault from Mac OS X system

Reimage is a tool to detect malware.
You need to purchase Full version to remove infections.
More information about Reimage.

  1. If you are using OS X, click Go button at the top left of the screen and select Applications. Cick 'Go' and select 'Applications'
  2. Wait until you see Applications folder and look for PDFdefault or any other suspicious programs on it. Now right click on every of such entries and select Move to Trash. Click on every malicious entry and select 'Move to Trash'
WindowsMac OS XInternet ExplorerMicrosoft EdgeFirefoxGoogle ChromeSafari

Remove PDFdefault from Internet Explorer (IE)

Reimage is a tool to detect malware.
You need to purchase Full version to remove infections.
More information about Reimage.

  1. Remove dangerous add-ons
    Open Internet Explorer, click on the Gear icon (IE menu) on the top right corner of the browser and choose Manage Add-ons. Click on menu icon and select 'Manage add-ons'
  2. You will see a Manage Add-ons window. Here, look for PDFdefault and other suspicious plugins. Disable these entries by clicking Disable: Right click on each of malicious entries and select 'Disable'
  3. Change your homepage if it was altered by virus:
    Click on the gear icon (menu) on the top right corner of the browser and select Internet Options. Stay in General tab.
  4. Here, remove malicious URL and enter preferable domain name. Click Apply to save changes. Delete malicious URL, enter your desired domain name and click 'Apply' to save changes
  5. Reset Internet Explorer
    Click on the gear icon (menu) again and select Internet options. Go to Advanced tab.
  6. Here, select Reset.
  7. When in the new window, check Delete personal settings and select Reset again to complete PDFdefault removal. Go to 'Advanced' tab and click on 'Reset' button. Now select 'Delete personal settings' and click on 'Reset' button again
WindowsMac OS XInternet ExplorerMicrosoft EdgeFirefoxGoogle ChromeSafari

Remove PDFdefault ads from Microsoft Edge

Reimage is a tool to detect malware.
You need to purchase Full version to remove infections.
More information about Reimage.

Reset Microsoft Edge settings (Method 1):

  1. Launch Microsoft Edge app and click More (three dots at the top right corner of the screen).
  2. Click Settings to open more options.
  3. Once Settings window shows up, click Choose what to clear button under Clear browsing data option. Go to Settings and select 'Choose what to clear'
  4. Here, select all what you want to remove and click Clear. Select 'Clear' button
  5. Now you should right-click on the Start button (Windows logo). Here, select Task Manager. Open the start menu and select 'Task Manager'
  6. When in Processes tab, search for Microsoft Edge.
  7. Right-click on it and choose Go to details option. If can’t see Go to details option, click More details and repeat previous steps. Right-click 'Microsoft Edge' and select 'Go to details' Select 'More details' if 'Go to details' option fails to show up
  8. When Details tab shows up, find every entry with Microsoft Edge name in it. Right click on each of them and select End Task to end these entries. Find Microsoft Edge entries and select 'End Task'

Resetting Microsoft Edge browser (Method 2):

If Method 1 failed to help you, you need to use an advanced Edge reset method.

  1. Note: you need to backup your data before using this method.
  2. Find this folder on your computer: C:\Users\%username%\AppData\Local\Packages\Microsoft.MicrosoftEdge_8wekyb3d8bbwe.
  3. Select every entry which is saved on it and right click with your mouse. Then Delete option. Go to Microsoft Edge folder on your computer, right-click every entry and click 'Delete'
  4. Click the Start button (Windows logo) and type in window power in Search my stuff line.
  5. Right-click the Windows PowerShell entry and choose Run as administrator. Find Windows PowerShell, right-click it and select 'Run as administrator'
  6. Once Administrator: Windows PowerShell window shows up, paste this command line after PS C:\WINDOWS\system32> and press Enter:
    Get-AppXPackage -AllUsers -Name Microsoft.MicrosoftEdge | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register $($_.InstallLocation)\AppXManifest.xml -Verbose}
    Copy and paste a required command and press 'Enter'

Once these steps are finished, PDFdefault should be removed from your Microsoft Edge browser.

WindowsMac OS XInternet ExplorerMicrosoft EdgeFirefoxGoogle ChromeSafari

Remove PDFdefault from Mozilla Firefox (FF)

Reimage is a tool to detect malware.
You need to purchase Full version to remove infections.
More information about Reimage.

  1. Remove dangerous extensions
    Open Mozilla Firefox, click on the menu icon (top right corner) and select Add-ons Extensions. Click on menu icon and select 'Add-ons'
  2. Here, select PDFdefault and other questionable plugins. Click Remove to delete these entries. Select 'Extensions' and look for malicious entries. Click 'Remove' to get rid of each of them
  3. Reset Mozilla Firefox
    Click on the Firefox menu on the top left and click on the question mark. Here, choose Troubleshooting Information. Click on menu icon and then on '?'. Select 'Troubleshooting Information'
  4. Now you will see Reset Firefox to its default state message with Reset Firefox button. Click this button for several times and complete PDFdefault removal. Click on 'Reset Firefox' button for a couple of times
WindowsMac OS XInternet ExplorerMicrosoft EdgeFirefoxGoogle ChromeSafari

Remove PDFdefault from Google Chrome

Reimage is a tool to detect malware.
You need to purchase Full version to remove infections.
More information about Reimage.

  1. Delete malicious plugins
    Open Google Chrome, click on the menu icon (top right corner) and select Tools Extensions. Click on menu icon. Select 'Tools' and 'Extensions'
  2. Here, select PDFdefault and other malicious plugins and select trash icon to delete these entries. Look for malicious entries and delete each of them by clicking on the Trash bin icon
  3. Click on menu icon again and choose Settings Manage Search engines under the Search section. When in 'Settings', select 'Manage search engines...'
  4. When in Search Engines..., remove malicious search sites. You should leave only Google or your preferred domain name. Click 'X' to remove malicious URLs
  5. Reset Google Chrome
    Click on menu icon on the top right of your Google Chrome and select Settings.
  6. Scroll down to the end of the page and click on Reset browser settings. When in 'Settings', scroll down to 'Reset browser settings' button and click on it
  7. Click Reset to confirm this action and complete PDFdefault removal. Click on 'Reset' button to complete your removal
WindowsMac OS XInternet ExplorerMicrosoft EdgeFirefoxGoogle ChromeSafari

Remove PDFdefault from Safari

Reimage is a tool to detect malware.
You need to purchase Full version to remove infections.
More information about Reimage.

  1. Remove dangerous extensions
    Open Safari web browser and click on Safari in menu at the top left of the screen. Once you do this, select Preferences. Click on 'Safari' and select 'Preferences'
  2. Here, select Extensions and look for PDFdefault or other suspicious entries. Click on the Uninstall button to get rid each of them. Go to 'Extensions' and uninstall malicious add-ons
  3. Reset Safari
    Open Safari browser and click on Safari in menu section at the top left of the screen. Here, select Reset Safari.... Click on 'Safari' and select 'Reset Safari...'
  4. Now you will see a detailed dialog window filled with reset options. All of those options are usually checked, but you can specify which of them you want to reset. Click the Reset button to complete PDFdefault removal process. Select all options and click on 'Reset' button
After uninstalling this potentially unwanted program (PUP) and fixing each of your web browsers, we recommend you to scan your PC system with a reputable anti-spyware. This will help you to get rid of PDFdefault registry traces and will also identify related parasites or possible malware infections on your computer. For that you can use our top-rated malware remover: Reimage, Plumbytes Anti-MalwareWebroot SecureAnywhere AntiVirus or Malwarebytes Anti Malware.

About the author

Julie Splinters
Julie Splinters - Malware removal specialist

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  • Enclave

    Be careful not to download PDFdefault instead of some PDF converter! hackers are only waiting for this to happen

  • QuopTech

    These ads! Annoying and useless! That simply cannot be tolerated