External Links

I have loaded a pdf file and it has internal links to the document that work just fine. But if I click on a link to an external site nothing seems to happen.

http://www.shorecrestptsa.org/test3

example would be the facebook link on page 3 does not go to facebook, but if I load it up in the default browser pdf viewer it opens.

http://wordpress.org/plugins/pdfjs-viewer-shortcode/