PDF EMBED - Adobe error msg

I get an adobe error message when trying to load the PDF page in an article.

file does not begin with '%PDF-'./index.php
on Safari and just a blank frame on Firefox and Chrome

Does this plugin work with my setup?

I am using:
PHP Version 5.4.35
Joomla! 3.3.6 Stable [ Ember ] 01-October-2014 02:00 GMT
Joomla Platform 13.1.0 Stable [ Curiosity ] 24-Apr-2013 00:00 GMT