unit1.pas definition, relationships, removal:

This is a part of a malicious parasite that violates user privacy and damages the compromised system. The unit1.pas file can be used for different purposes depending on the related parasite's type, functionality and carried payload. Although unit1.pas may not take any malicious actions by itself, it ensures that a parasite is working properly and therefore needs to be removed. DO NOT open, execute or edit unit1.pas!
The unit1.pas file is installed and used by keylogger Keylogger 2.0. It is also related to other parasites such as keylogger Professional Spy KeyLogger, AudioDoor, Backdoor.BeastDoor, Guangwaigirl, Hell-Driver, Institution Open, ProAgent, Project Mayhem 1.0 and Remote Commander b3.2. These threats can use unit1.pas for different purposes, as the file's functionality depends on a particular parasite it belongs to.
Sometimes a presence of unit1.pas does not indicate that your computer is infected. It can be an essential system file or a file installed by harmless legitimate software and therefore may not pose any threat to your privacy and the system. Although such cases are quite rare, you should thoroughly examine unit1.pas before completely deleting or leaving it in the system.