Test files contain ClamAV-Test-Signature.
You need unrar 3.0 to test rarfail.rar. Only clamscan is able to scan this
file (clamd depends on libclamav, which has no support for the new RAR format).
Please use clamscan --unrar, and it will automatically switch to the unrar
utility after an internal (libclamav's) RAR error.