at1.job is a file, which can be related to a long list of viruses. There are tens of trojans, worms and other viruses that create this file and use it for implementing their malicious activities. Please, do NOT leave at1.job and viruses that might be related to it on your computer! For checking the system and eliminating all malicious programs from it we recommend using Reimage Reimage Cleaner Intego.
Typically, .job files are used for identifying how to run a task. So, at1.job is dangerous in itself. However, it can be used for truly malicious activities. If it is created and used by a parasite, at1.job can be used for launching a virus, updating it, blocking anti-virus and other unwanted activities. Please, double check this file before leaving it on your computer! For that we suggest you to use RegCure Pro.