Ubuntu Security Notice 973-1 – Will Dormann, Alin Rad Pop, Braden Thomas, and Drew Yao discovered that the Xpdf used in KOffice contained multiple security issues in its JBIG2 decoder. It was discovered that the Xpdf used in KOffice contained multiple security issues when parsing malformed PDF documents.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/92846/USN-973-1.txt
Source: https://packetstormsecurity.com/files/92846/Ubuntu-Security-Notice-973-1.html