Im actually dont think it has to do with the size but more with the width/height and scaling of viewport and canvas..the default set in the 'SimpleViewer' doesnt display all pdfs. what changes have to be done for all pdfs to display
Today such plugin is not so useful. Why not use the native PDF rendering of the device? Loading the PDF in an iframe or External Browser (if you're using PhoneGap) would be enough and hassle-free.
I tried: scroll and pinch-to-zoom works well.