The remote host is missing an update to poppler announced via advisory USN-759-1.

The problem can be corrected by upgrading your system to the following package versions: Ubuntu 6.06 LTS: libpoppler1 0.5.1-0ubuntu7.5 libpoppler1-glib 0.5.1-0ubuntu7.5 Ubuntu 8.04 LTS: libpoppler-glib2 0.6.4-1ubuntu3.2 libpoppler2 0.6.4-1ubuntu3.2 Ubuntu 8.10: libpoppler-glib3 0.8.7-1ubuntu0.2 libpoppler3 0.8.7-1ubuntu0.2 In general, a standard system upgrade is sufficient to effect the necessary changes. https://secure1.securityspace.com/smysecure/catid.html?in=USN-759-1

Will Dormann, Alin Rad Pop, Braden Thomas, and Drew Yao discovered that poppler contained multiple security issues in its JBIG2 decoder. If a user or automated system were tricked into opening a crafted PDF file, an attacker could cause a denial of service or execute arbitrary code with privileges of the user invoking the program.