The remote host is missing an update to xpdf-i announced via advisory DSA 226-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%20226-1

iDEFENSE discovered an integer overflow in the pdftops filter from the xpdf and xpdf-i packages that can be exploited to gain the privileges of the target user. This can lead to gaining privileged access to the 'lp' user if thee pdftops program is part of the print filter. For the current stable distribution (woody) xpdf-i is only a dummy package and the problem was fixed in xpdf already. For the old stable distribution (potato) this problem has been fixed in version 0.90-8.1. For the unstable distribution (sid) this problem has been fixed in version 2.01-2. We recommend that you upgrade your xpdf-i package.