In 2011, Shadowserver tested over 25 million samples against Clam AV and numerous other antivirus products.Out of the 25 million samples tested, Clam AV scored 76.60% ranking 12 out of 19, a higher rating than some much more established competitors.Both Clam AV and its updates are made available free of charge.
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However, false positive rates are inherently higher than those of traditional malware detection.
Sanesecurity is an organization that maintains a number of such databases; in addition they distribute and classify a number of similar databases from other parties, such as CRDF Threat Center, Porcupine, Julian Field, Malware Patrol.
The build process is simple and provides basic functionality, including: library, clamscan utility, clamd daemon and freshclam for update.