"Complete PDF" Option In Acrobat Mixing With CDONTS?

I'm playing around with Acrobat at the moment and here's what I need to do.

(1) Have users online fill in a PDF form in Acrobat Reader.
(2) The users Submit it as a "complete PDF".
(3) It is emailed immediately via CDONTS (MS IIS platform).
(4) Users get a thank you message.

I'm currently using an ASP/VBS script for "pure ASP" upload. This script works fine as tested with a standard HTML multipart/form-data form. However, when the PDF is "submitted" the file appears to be lost. ASP can't get hold of it to save it to the server. How on earth do you get this to work?

My required steps are:

(1) Acrobat PDF file submitted.
(2) PDF file saved to disk on the server.
(3) PDF file attached to email and sent.
(4) PDF deleted from server.
(5) Thank you message served to user.

Step (2) is the sticking point! (Or rather, somewhere between steps (1) and (2)!) Everything else when independantly tested is fine.

I have already looked in to the FDF stuff at www.planetpdf.com, but I can't use the FDF Toolkit because I can't get it verified, signed off and installed by IT in time for this project's go live date, so I'm bound in to the route I'm taking!

Can anyone shed any light as to why this isn't working, how Acrobat posts the file (the form enctype) or any other sticking points I haven't thought of. Perhaps I can skip a step and just take the file straight from the buffer to the mail attachment?