Transfer PDF file using BAPI

Hi friends,

My requirement is:

I need to transfer PDF file to portal which should be displayed in front end. BAPI method will be called from PORTAL. I am creating a RFC FM to create a BAPI method. Now the question is how can I be able to transfer PDF file using Function Module where only Tables parameter can be used.

Any idea on this? Do let me know if you need some clarification.

Thanks in advance.

Rgds,

AK