To read Adobe PDF files you will require Adobe Acrobat Reader, which should be included automatically in your web browser.
If it is not installed, you can download it from the Adobe website using the above link.

If you are not able to use Adobe Acrobat Reader you can use the online tool which converts PDF files to a format which can be used with screen-reading programs. This is available on the Adobe Accessibility site. Online conversion tools for Adobe PDF documents (for the best results, select the "text" format).