When you say "embedded Acrobat" do you mean that you are displaying a PDF in a browser using an EMBED tag? So far as I know there is no interface to that environment (but I'd be happy to be shown wrong), whether the user owns Acrobat or just the free Adobe Reader.
I'd be very wary of such a solution if there was one, since more and more people are using Chrome, FireFox etc. with non-Adobe PDF display technology, and unless you are working in a corporate setting, you may have trouble persuading them of a need to change.