This indicates an attack attempt against a Memory Corruption vulnerability in Apple QuickTime Player.
The vulnerability is caused by an error when the software handles a malicious crafted movie file. It could allow a remote attacker to execute arbitrary code via sending a crafted ".qtvr" movie file.
Mac OS X v10.6 through v10.6.7,
Mac OS X Server v10.6 through v10.6.7
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the patch supplied by the vendor: