Hi,

I think that installing following files will fix your problem.

https://archives.fedoraproject.org/pub/archive/epel/6/i386/Packages/c/clamav-0.100.3-1.el6.i686.rpm
https://archives.fedoraproject.org/pub/archive/epel/6/i386/Packages/c/clamav-db-0.100.3-1.el6.i686.rpm

Please test first on your test system. I only tested on centos 6.7 x32

"if it breaks, you can keep both pieces"

Eero