MS07-010 is not categorized as virus, worm, Trojan or backdoor. It is a critical vulnerability in Malware Protection Engine in certain security components, which allows arbitrary code to be remotely executed in the vulnerable computer.
The Malware Protection Engine provides the scanning, detection and cleaning features to the following antivirus: Windows Live OneCare, Forefront Security, Antigen and Windows Defender.
If exploited successfully, MS07-010 allows hackers to gain remote control of the affected computer with the same privileges as the logged on user. If this user had administrator rights, the hacker could take complete control of the system: create, modify or delete files, install programs, create new user accounts, etc.
This vulnerability can be exploited by creating a specially crafted PDF file and forcing a vulnerable system to process it. It can also be exploited by hosting a specially crafted PDF file in a web page and enticing users into accessing it.
If you have any of the vulnerable programs, it is recommended to download and apply the security patch for this vulnerability. Click here to access the web page for downloading the patch.