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?

>>6
That's not bash, that's grep along with standard globbing.

No bash-specific features.

strings is for strings in binaries, it's not supposed to be used for this.