It is a generic detection for images in JPG format that attempt to exploit the Buffer Overrun in JPEG processing vulnerability. 

This vulnerability allows to download a file from the Internet and run it on the affected computer, if the image is opened with a vulnerable application. The downloaded file will usually have a malicious nature: viruses, worms, Trojans, spyware, adware, etc. 

It is very recommendable to visit Microsoft's official website and check whether any application vulnerable to Buffer Overrun in JPEG processing is installed on your computer, and if so, apply the corresponding security patch.