I use a iframe with the option embeded and insert my code html like that:
"<**"**iframe src=“http://docs.google.com/gview?url=http://www.uv.mx/veracruz/sea/files/2016/03/ADMIN-BLOQUE-II-3.pdf&embedded=true” style=“width:100%; height:1024px;” frameborder=“0” scrolling=“NO”>
Just upload your pdf file in a webserver or your hosting and obtain the link of file and put into the code that I put in color blue and bold, and ready you will see pdf files in xibo player. Please copy and paste the code without “<” just put: < iframe… and all the code. ¡Greetings!