Ubuntu Security Notice 603-1 – It was discovered that the poppler PDF library did not correctly handle certain malformed embedded fonts. If a user or an automated system were tricked into opening a malicious PDF, a remote attacker could execute arbitrary code with user privileges.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/65618/USN-603-1.txt
Source: https://packetstormsecurity.com/files/65618/Ubuntu-Security-Notice-603-1.html