This sounds like a terrible idea. I don't know why people decided to start deploying "PDF Applications" but it's a terrible idea. Go look at UPS's api documentation. It's a pdf "app" that requires you to install the most recent version of adobe reader to "run," and then it is slow and much harder to use than just a regular pdf or heaven forbid, html.
If anyone can tell me why anyone would ever use this technology over html, please, I'd love to hear it.