Adobe has finally created a PDF Reader PDF app for Windows 8 on mobile devices (Windows 8 was released in 2012). The free app has a range of basic functions for PDF.
The Adobe Acrobat app can open and read password protected PDFs, once a PDF is open the app can copy and paste, search text for specific words, zoom. The supported bookmarks allows navigation with thumbnails, page-by-page or in continuous scroll mode viewing, support for hyperlinks gives the user the option go directly to a webpage or to a particular section of a PDF.
OK, so you want to stamp your document. Maybe you need to give reviewers some advice about the document's status or sensitivity. This tip from author Ted Padova demonstrates how to add stamps with the Stamp Tool along with related comments.