I just downloaded a quick and dirty little tool called File Juicer (
http://echoone.com/filejuicer/). Thought it was pretty cool and assumed it did exactly what you were looking for. Finally found a PDF with a bunch of jpg images that it was able to pull.
Since it is 8MB I'm adding a link rather than the file itself.
http://csrc.nist.gov/publications/ni...Mar07-2007.pdf