You could look at pdf.js, a fairly new solution to render pdf using just html and js. I realize this sounds like a prank, but I am not kidding here, I didn’t believe it either until I first saw it.
Since it’s still young there may be glitches (they say so themselves), but it looks very promising I think. Worth a try at least I’d say
Chrome also has it’s own pdf reader (I don’t mean the Adobe Reader plugin, they really have their own reader), but I don’t know what that is. It may be (based on?) pdf.js as well?
Many thanks for that. Safely bookmarked. Being HTML5, might not be the one for the project in hand as I need to support IE6, though there is a IE hack on Github.