Possibly a mass mailing worm
F-Secure Anti-Virus uses generic, heuristic methods to detect unknown harmful programs. These methods are not foolproof, and will miss some harmful programs while sometimes labeling clean programs as possibly destructice.
When you encounter a file labeled as "Possibly infected", send a sample to our sample submission address for further analysis.
Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.
More information on scanning and removal options available in your F-Secure product can be found in the Help Center.
You may also refer to the Knowledge Base on the F-Secure Community site for more information.