Clear out all those bogus directories and file plus everything under the ClamAV db directory. Once that is done run
Code:
su - zimbra
/opt/zimbra/clamav/bin/freshclam --config-file=/opt/zimbra/conf/freshclam.conf
zmantivirusctl stop
zmantivirusctl start
This will reset the definition files. I reckon that the freshclam process is failing for some reason and generating all those rogue directories.