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?

thanks i actually came back to post that i found that out

grep 'Rar!' *.jpg tells me exactly what i want. bash is so fucking  useful. :)

strings doesn't work though. I'm using cygwin on windows, maybe thats why.