False positive or not?

Hello, Is this a False Positive I tried going to hxxp://20b.org just for fun and Avast popped up saying its not safe. so is this a false positive or not? (See picture below)

I did a virus total scan on the link and the results are http://www.virustotal.com/file-scan/report.html?id=bb2a5c3725e7353bde52c2b68c5c40d2edaf2620a65db9d5a5cd337dee5527fa-1286928484

This rickroll is a browser exploit, which blocks closing the window and you need to shut down the browser. Whilst this is more infuriating than malicious I wouldn’t call it a false positive.