AVG antivirus Bioshock - Obfustat.jxr false positive - PC Perspective Forums
here's what another forum said about bioshock's .exe, which also uses securom anti-piracy files and .exe's.
and this AVG free forum thread has a few good lines about the tomb raider anniversary obfustat, but he's so busy correcting members and talking about forum policy, you'll have to sift through it:
AVG Free Forum :: Removing Viruses, Virus Removal Tools :: obfustat.nh virus?
AVG fixes these issues through updates, so it'll either go away in a few days, or it won't be resolved until Crysis is alpha-released.