1. Edit Content on your text module
2. Click "Source" button
3. Paste the following line into the code view:
   
   <embed height="500" width="300" src="http://yourdomain.com/portals/0/pdfs/Filename.pdf"></embed>
    
4. Change the height, width and path to your pdf for your needs
5. Click the "Source" button again
6. Save
7. Go back and adjust the numbers again. ;) 

There are some display options, for example, you don’t have to see the Adobe tool bars. See this page for more help with this.

http://blogs.adobe.com/pdfdevjunkie/2007/08/using_the_html_embed_tag_to_di.html