You may try this pdf converter, it can help you convert pdf file to jpg image file, and then you can upload the image to FB.
http://www.pdftoworddoc.com/pdf-converter.html
If you have any other questions, feel free to email me.
You really just need to convert a multipage PDF file into several JPG files and then publish your status on Facebook. Each Facebook status allows publishing up to 40 photos. To convert a file to JPG you can use any online converter. If you need to do this often, it’s easier to install a virtual printer. I myself use print-driver.com