http://www.prevx.com/blog/147/Antimalwa ... eless.html
"Antiviruses are not intended to be the all-in-one solution against malware problem. Here at Prevx we are the first who are saying that the only signature-based standard approach is not anymore sufficient to fight against malware. But there are even other technologies that work together with the standard detection method: local heuristic techniques, intelligent behavior-based blockers, in-the-cloud technologies, all new technologies that help detecting brand new malwares and variants of already known malwares. And they actually catch far more than 10% of malware out there."