Test an image for GDI+ hack?

Is there a way to test an image to see if it has the GDI+ exploit?  I know how to test if my computer is VULNERABLE for the GDI+ exploit, but that's not what I want.  I want to see if an image is using the exploit.

My firewall is blocking a particular PDF saying: Error: "Attack Info: Malformed JPEG"  

How can I find out if this is a false positive, or if this image really is a hack/exploit?

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I think it would be better if you tested before if your system is vulnerable to GDI+, then simply open your image in a test (not production) environment where you did not patch the problem.
Take also a look ad this excerpt taken from http://www.informit.com/guides/content.asp?g=security&seqNum=52
" At the very beginning of a JPEG file, there is a value that tells the parser if there is comment data included with the jpeg file. If there is no comment, the value is set to '2', or it is higher if there is a comment. If you insert a '1' or '0' in this location, the GDI+ code will use this information and overwrite the stack with data, which may allow an attacker to execute their own code. The following is an example of what the first several bytes of a potentially dangerous jpeg look like:
FF D8       - designated JPEG header
FF E0       - Start of comment section
00 10       - Indicates problem (should be 00 20)
4A 46 49 46       - JFIF

The danger in this is that one day after the vulnerability was posted, an example was released. This simplifies the exploit creation process by giving potential attackers a solid place to start. Windows XP (not SP2) was found to be vulnerable, as well as a collection of other software packages that use this dll to process jpeg images. Note: Antivirus companies are detecting this anomaly and calling it Bloodhound. "

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