The remote host is missing an update to poppler announced via advisory USN-850-1.

The problem can be corrected by upgrading your system to the following package versions: Ubuntu 6.06 LTS: libpoppler1 0.5.1-0ubuntu7.6 libpoppler1-glib 0.5.1-0ubuntu7.6 Ubuntu 8.04 LTS: libpoppler-glib2 0.6.4-1ubuntu3.3 libpoppler2 0.6.4-1ubuntu3.3 Ubuntu 8.10: libpoppler-glib3 0.8.7-1ubuntu0.4 libpoppler3 0.8.7-1ubuntu0.4 Ubuntu 9.04: libpoppler-glib4 0.10.5-1ubuntu2.4 libpoppler4 0.10.5-1ubuntu2.4 In general, a standard system upgrade is sufficient to effect the necessary changes. https://secure1.securityspace.com/smysecure/catid.html?in=USN-850-1

It was discovered that poppler contained multiple security issues when parsing malformed PDF documents. 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.