The Debian package clamav version 0.99+dfsg-0+deb6u1 ships the latest upstream version and may be required tomake use of all current virus signatures and to avoid warnings. Due to a change in soname included with this release, libclamav has been updated to libclamav7. This requires updates to external users of libclamav. For python-clamav, klamav, and libclamunrar, these changes are, or will be shortly, available. It also requires an update of the dansguardian package to version 2.10.1.1-3+deb6u1.
UCS 3.2 is out of maintenance. I guess we don't need to fix this issue.