My understanding of your question is that you want to store PDF files in your SQL Server. The recommented way is to just store the file path in the table. Bcoz, if u r going to store the whole file inside the SQL Server then it will put lot of extra overhead on the server.
As sudar has suggested..
it is recomended to save the file on the disk and store a pointer to the file in the database, but if u decide other wise then this link may be helpfull: http://www.sqlteam.com/item.asp?ItemID=986