The remote host is missing an update to pdftohtml announced via advisory DSA 983-1. Derek Noonburg has fixed several potential vulnerabilities in xpdf, which are also present in pdftohtml, a utility that translates PDF documents into HTML format. The old stable distribution (woody) does not contain pdftohtml packages.

For the stable distribution (sarge) these problems have been fixed in version 0.36-11sarge2. For the unstable distribution (sid) these problems have been fixed in version 0.36-12. We recommend that you upgrade your gpdf package. https://secure1.securityspace.com/smysecure/catid.html?in=DSA%20983-1