The remote host is missing an update to clamav announced via advisory DSA 1771-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%201771-1

Several vulnerabilities have been discovered in the ClamAV anti-virus toolkit: CVE-2008-6680 Attackers can cayse a denial of service (crash) via a crafted EXE file that triggers a divide-by-zero error. CVE-2009-1270 Attackers can cause a denial of service (infinite loop) via a crafted tar file that causes (1) clamd and (2) clamscan to hang. (no CVE Id yet) Attackers can cause a denial of service (crash) via a crafted EXE file that crashes the UPack unpacker. For the old stable distribution (etch), these problems have been fixed in version 0.90.1dfsg-4etch19. For the stable distribution (lenny), these problems have been fixed in version 0.94.dfsg.2-1lenny2. For the unstable distribution (sid), these problems have been fixed in version 0.95.1+dfsg-1. We recommend that you upgrade your clamav packages.