<iframe src="http://docs.google.com/gview?url=http://domain.com/Tools/file_direct_link.html?node_id=123456&embedded=true"; style="width:718px; height:700px;" frameborder="0"></iframe>
Important: You need to replace http://domain.com/Tools/file_direct_link.html?node_id=123456 with the corresponding Permanent URL of your PDF file.
NOTE: This snippet is provided as is, with no express or implied warranty for accuracy or accessibility.