In order to view .pdf files you will need to
use PDF viewing software such as Adobe™ Acrobat Reader.
The viewer itself is free, just click the link to download the most recent version of Acrobat Reader from the Adobe™ website:
Adobe™ Acrobat Reader
For an ADA compliant version of Acrobat Reader which contains support for screen readers and also for tools to convert Adobe PDF documents into HTML or ASCII text click this link:
access.adobe.com