For whatever reason there would appear to be packed file run when you click on that link, see image 1 and that is what I think avast is alerting on (that is what the gzip bit in the location indicates, image 2).
There is also another javascript file that is loaded that has some obfuscated script in it, but I don't think that that is the problem.
What I do believe the true problem is, is that someone has posted an autorun script in the first post (image 3), that should have been posted as an image as the text of the contents of an autorun.inf file wouldn't be differentiated from actual code, hence the malware name BV:AutoRun-AG [Wrm] as to all intents an purposes avast believes that is what it is an autorun script.
This happens with monotonous regularity when someone posts the actual code on a page.
