Could you provide the information requested in https://bugs.launchpad.net/ubuntu/+source/clamav/+bug/784797/comments/8 - I agree it looks similar.
- Bug#678247: [clamav-freshclam] Clamav cannot generate a pr... Valerio Passini
- Bug#678247: [Pkg-clamav-devel] Bug#678247: [clamav-fr... Scott Kitterman