The remote host is missing an update to xpdf announced via advisory DSA 1537-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%201537-1

Alin Rad Pop (Secunia) discovered a number of vulnerabilities in xpdf, a set of tools for display and conversion of Portable Document Format (PDF) files. The Common Vulnerabilities and Exposures project identifies the following three problems: CVE-2007-4352 Inadequate DCT stream validation allows an attacker to corrupt memory and potentially execute arbitrary code by supplying a maliciously crafted PDF file. CVE-2007-5392 An integer overflow vulnerability in DCT stream handling could allow an attacker to overflow a heap buffer, enabling the execution of arbitrary code. CVE-2007-5393 A buffer overflow vulnerability in xpdf's CCITT image compression handlers allows overflow on the heap, allowing an attacker to execute arbitrary code by supplying a maliciously crafted CCITTFaxDecode filter. For the stable distribution (etch), these problems have been fixed in version 3.01-9.1+etch2. For the unstable distribution (sid), these problems have been fixed in version 3.02-1.3. We recommend that you upgrade your xpdf packages.