It's Adobe Acrobat. I don't think there's a free version of that. Then again, I have no idea what program devduttaa is using....
Might help a bit if we knew so we could look into it. PDF does support it, but does his converter?
Side thought: It's annoying enough when a web page starts talking to me, but if my BOOK wants to start a conversation? I'm gonna jump off a cliff....