CVE-2007-1452 (The FDF support (ext/fdf) in PHP 5.2.0 and earlier does not implement the input filtering hooks for ext/filter, which allows remote attackers to bypass web site filters via an application/vnd.fdf formatted POST.)
CVE-2007-1412 (The cpdf_open function in the ClibPDF (cpdf) extension in PHP 4.4.6 allows context-dependent attackers to obtain sensitive information (script source code) via a long string in the second argument.)