Clamav bugged out after running well for over a year now.
the last few lines of /opt/zimbra/log/clamd.log
LibClamAV Error: cli_hex2str(): Malformed hexstring: This ClamAV version has reached End of Life! Please upgrade to version 0.95 or later. For more information see Clam AntiVirus and www.clamav.net/download (length: 169)
LibClamAV Error: Problem parsing database at line 742
LibClamAV Error: Can't load /tmp/clamav-f8998884121bd2319bf595aac26b459f/daily.ndb: Malformed database
LibClamAV Error: Can't load /opt/zimbra/data/clamav/db/daily.cvd: Malformed database
Thu Apr 15 18:31:39 2010 -> ERROR: Malformed database
ERROR: Malformed database
following the instructions on ClamAV - Reset Defs DB - Zimbra :: Wiki
i tried to reset the databases, and after redownloading the dbs same error occurs.