Clam Antivirus. Be safe.

Clam Antivirus
Clam Antivirus is an open source (GPL) anti-virus toolkit for UNIX, designed especially for e-mail scanning on mail gateways. It provides a number of utilities including a flexible and scalable multi-threaded daemon, a command line scanner and advanced tool for automatic database updates. The core of the package is an anti-virus engine available in a form of shared library.
command-line scanner
fast, multi-threaded daemon with support for on-access scanning
milter interface for sendmail
advanced database updater with support for scripted updates and digital
signatures
virus scanner C library
on-access scanning (Linux® and FreeBSD®)
virus database updated multiple times per day (see home page for total
number of signatures)
built-in support for formats, including Zip, RAR, Tar, Gzip, Bzip2, OLE2, Cabinet, CHM, BinHex, SIS and others
built-in support for almost all mail file formats
built-in support for popular document formats including MS Office and
MacOffice files, HTML, RTF and PDF
built-in support for ELF executables and Portable Executable files
compressed with UPX, FSG, Petite, NsPack, wwpack32, MEW, Upack and
obfuscated with SUE, Y0da Cryptor and others








