Testing an image directory for hidden rars?

How would someone go about quickly testing each and every image to see if it had a rar or any other file hidden inside of it? What language would be best for doing this, if a tool isn't already available?

>>18 here, I would enjoy Haskell if my brain was advanced enough to understand it. Alas, this is not the case, so all I can do is attack it with silly arguments and pretend C is the best language ever, in order to hide my stupidity.