You can't pull a signature into a file. That would imply signatures,
once made, could be separated and the stuck on other documents that
the user never saw and never signed!
A signature is integral with the file. You need to submit the whole
file. (Acrobat forms appear to submit sending only the signature
portion of the file, but I can't see this for designer forms).
From
http://www.adobe.com/devnet/livecycle/articles/designer_coldfusion.html,
"PDF [format] submits a package containing an embedded PDF file.
Choose this format if the form contains a signature field..."
Aandi Inston