Searching for a pptx and pdf viewer
You can convert your PDF to a series of images and show them as slideshow, using the PDF To ImageField module.


  The PDF To ImageField module provides automatic conversion of uploaded PDF files to images.
  It can be used either to create a snapshot of the front page to use as a preview thumbnail, or to generate a gallery of images from each page in the document.
  
  The module is implemented as CCK widget for FileField where PDFs are uploaded to. It places generated images into a CCK ImageField on the same content type.