I think everybody understood what I'm going to describe in this article. Yes: this is proverbal "how to make PDF files searchable?". Why do I want to put this solution here? Because it is a one more efficient source that could help someone to fight against his / her problem.
First of all let me describe the environment I have been implementing this solution: WFE Server (Windows Server 2008 R2 Standard, x64-bit platform), SQL Server 2008, they are separated, WSS 3.0 + Search Server 2008 Express (SP1 and SP2 must be installed), Adobe Reader X (ver. 10.1.0).
STEPS to perform search by PDF files