It indicates an attacker attempted a PHP Injection attack against PHPGreetz. PHPGreetz is vulnerable to a PHP Injection Attack. The "content.php" script does not sufficiently sanitize user-supplied input in the "content" parameter. This could allow an attacker to execute arbitrary PHP commands against the system.
phpGreetz phpGreetz 0.99
Compromise of the affected system.
Apply appropriate patch from the vendor or Upgrade to non-vulnerable version if available.