“the_post_attachment” function similar to “the_post_image” for other attachments

Hi!

I wonder if it would be easy to design a function similar to “the_post_image” which could consent me to get the URL of an attached PDF file. I want to attach to every post not only an image but a PDF. It would be very useful for me if a link to that PDF could appear directly and under certain style definitions, as the photo does (that is, without the need of inserting it manually).

Can anybody help?

Thanks in advance!