Retrieving Files from sql server

Does anyone have any ideas as to how I could extract a file (.pdf) which is stored in a sql server table and save it in a file system? The pdf's need to be stored in the database so that I can restrict access to them to their respective client. I need to pull them out and temporarily store them in a file system so that they can be attached to an email message using cdosys. The pdf would then be instantly deleted from the file system.