Were did you get your copy of Flash_Disinfector.exe as it is a relatively old piece of software which hasn’t changed as far as I’m aware.

I got mine via here, http://experi3nc3.wordpress.com/2007/05/10/flash-disinfector-by-subs/, so that is coming from the source/maker and the bleeping computers site download and that matches my copy MD5.

The MD5 of the file you uploaded to VT (MD5: a37c8c8523b2027897be24c9dec7cf35) matches that which I posted. and I still don’t get any alert on this with the latest VPS 111210-1. So I can’t see why avast would alert on it in VT, possibly as the last update on VT for avast! is showing as 2011.12.09 (yesterday).

Is avast still alerting on your system ?

EDIT: Scans by avast, MBAM and SAS on it find nothing.