The remote host is missing an update to libextractor announced via advisory DSA 1349-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%201349-1

It was discovered that an integer overflow in the xpdf PDF viewer may lead to the execution of arbitrary code if a malformed PDF file is opened. libextractor includes a copy of the xpdf code and required an update as well. For the oldstable distribution (sarge) this problem has been fixed in version 0.4.2-2sarge6. The stable distribution (etch) isn't affected by this problem. The unstable distribution (sid) isn't affected by this problem. We recommend that you upgrade your libextractor packages.