Features
ClamAV includes a number of utilities: a command-line scanner, automatic database updater and a scalable multi-threaded daemon, running on an anti-virus engine from a shared library.
The application also features a Milter interface for sendmail and on-demand scanning. It has support for Zip, RAR, Tar, Gzip, Bzip2, OLE2, Cabinet, CHM, BinHex, SIS formats, most mail file formats, ELF executables and Portable Executable (PE) files compressed with UPX, FSG, Petite, NsPack, wwpack32, MEW, Upack and obfuscated with SUE, Y0da Cryptor. It also supports many document formats, including Microsoft Office, HTML, Rich Text Format(RTF) and Portable Document Format (PDF).
The ClamAV virus database is updated several times each day and as of 21 August 2010 contained 818,106 virus signatures.
Effectiveness
ClamAV was included in comparative tests against other antivirus products. In the 2008 AV-Test it rated: on-demand: very poor, false positives: poor, on-access: poor, response time: very good, rootkits: very poor.
ClamAV is currently tested daily in comparative tests against other antivirus products on ShadowServer. In 2010 ShadowServer tested over 22 million samples against ClamAV and numerous other antivirus products. Out of the 22 million samples tested ClamAV scored 76.64% ranking 9 out of 19, a higher rating than some much more established competitors.
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