This indicates an attack attempt against a heap-based buffer-overflow vulnerability in Apple QuickTime on Windows.
The vulnerability is due to the software's inability to handle malformed Clipping Region (CRGN) atom types in a QuickTime movie file. A remote attacker may exploit this by sending a specially crafted movie file.
Apple QuickTime before 7.6.2
System compromise or denial of service.
Please refer to the vendor's web site for updates or patches: