This attack could pose a serious security threat. You should take immediate action to stop any damage or prevent further damage from happening.
Exploit protection detected an attempt to place shellcode onto the heap in order to gain control of an application.
Heap spray exploits compromise an application by placing shellcode onto the heap then executing it through various vectors. Attackers may obtain full control of the application if the shellcode is executing.
The compromised process was terminated in order to disrupt the attack and prevent infection; no further action is necessary for this incident.
If further information is desired, or this event reoccurs, please submit the most recently visited URL or most recently opened document to Symantec for further analysis. Please visit http://www.symantec.com/docs/TECH102419 for more information.
For Symantec enterprise products, additional details may be found at http://www.symantec.com/docs/HOWTO127057