Some weaknesses have been reported in various McAfee products, which can be exploited by malware to bypass the scanning functionality.

The weaknesses are caused due to errors in the handling of archive file formats (e.g. RAR and ZIP), which can be exploited to bypass the anti-virus scanning functionality via specially crafted archive files.

Solution
Update .DAT files to DAT 5600 or later.
Further details available to Secunia VIM customers

Provided and/or discovered by
* Thierry Zoller
* The vendor also credits Mickael Roger.

Original Advisory
McAfee:
https://kc.mcafee.com/corporate/index?page=content&id=SB10001&actp=LIST_RECENT

Thierry Zoller:
http://blog.zoller.lu/2009/04/mcafee-multiple-bypassesevasions-ziprar.html

Deep Links
Links available to Secunia VIM customers