Submit form with attachments

hi..

I have to develop a process that submits a form with attachments.
My question is, can we extract the attachments from the subbmitted form? If yes, in which format the attachments will be extracted?
If no, how will the form be submitted, can it be converted to xml or will it remain as pdf only?

I am new to LiveCycle, kindly provide me the suggestions...

Thanks and Regards,
Ambika