Hello HyperGeek,
It could well be that the avast shield protected your computer from downloading that generic trojan, see what Norton has to say on this one: http://www.symantec.com/avcenter/cgi-bin/virauto.cgi?vid=42272
It might be you had a lucky escape or when you weren’t vulnerable to the exploit,
the scans are just to make sure your computer is OK.
Also look here for the report on this threat at that site: http://www.malware.com.br/cgi/search.pl?id=VHJvamFuLkdlbmVyaWMuMzE5NDA1NA==
Also very reputable, respectable sites are being hacked and will get injected with malware if there is a vulnerability found in the website application software.Whenever malcreants find a tiny hole to inject their malcreations they will not hesitate to do so, mostly with automatic toolkits etc.
I would inform the admin of that site and link to this thread, so he may seek help to cleanse his site from this malcode,
polonus