I may be able to help you. I did this for a client once. You may view the form here :
http://www.impex5.com/request.html
It's basically an HTML form with a file upload addon. The client completes the necesary fields (name, company etc), uploads the file from his computer and a PHP script processes the information and sends the email (with attachment) to a given email address.
If this is what you are looking for, you may find the code on the tutorials board on my forum :
http://crazyleafdesign.com/forum/YaBB.pl?num=1169041446
Of course you need to tweak it a bit to suit your needs.
Good luck