Q: Is it possible to monitor on which page the user is so that we can know whether the PDF document was read to the last page (scrolled)?
A:
pdftron.PDF.PDFViewCtrl (and PDFView) has both the method GetCurrentPage (which allows you to check which page is the most visible) and the method SetCurrentPageProc. (which allows you to pass a callback to be called when the current page changes)