Some users reported that their AV was detecting JS/Exploit-BO virus, on sites like ESPN and Friendster, for instance.

The problem is with the McAfee AV.

McAfee just released an Emergency DAT to fix the false on some JavaScripts, detecting as JS/Exploit-BO on virus database  (DAT file) 5197 released today.

The new DAT just released is 5198 and the url to download it is:
http://www.mcafee.com/apps/downloads/security_updates/dat.asp

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Pedro Bueno (pbueno //&& // isc. sans. org )