Packed.Generic.265 is a heuristic detection for a packer used by the following threat families:
A packer is a tool that compresses, encrypts or obfuscates executable files. Malware authors often use packers to conceal threats from detection by antivirus software. Packed.Generic.265 detects a packer that is not known to be used for legitimate purposes.
Files that are detected as Packed.Generic.265 may be malicious. We suggest that you submit to Symantec Security Response any files that are detected as Packed.Generic.265. For instructions on how to do this using Scan and Deliver, read Submit Virus Samples
Symantec Security Response encourages all users and administrators to adhere to the following basic security "best practices":