The remote host is missing an update to clamav announced via advisory DSA 1680-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%201680-1

Moritz Jodeit discovered that ClamAV, an anti-virus solution, suffers from an off-by-one-error in its VBA project file processing, leading to a heap-based buffer overflow and potentially arbitrary code execution (CVE-2008-5050). Ilja van Sprundel discovered that ClamAV contains a denial of service condition in its JPEG file processing because it does not limit the recursion depth when processing JPEG thumbnails (CVE-2008-5314). For the stable distribution (etch), these problems have been fixed in version 0.90.1dfsg-4etch16. For the unstable distribution (sid), these problems have been fixed in version 0.94.dfsg.2-1. The testing distribution (lenny) will be fixed soon. We recommend that you upgrade your clamav packages.