I am at work, and I am able to make PDF's with anything. If you need it done email me the jpeg's and I'll pdf them.
Also if you email me, do you want them as one file, or four files?
CutePDFwriter is a neat app. Installs like a printer, then instead of printing your picture or document it converts it to PDF and asks you where to save it.
available on www.snapfiles.com