I ran into this issue on my site as well. I addressed it by forcing the
PDF to download instead of open in the browser. You can force download
with a few lines in an .htaccess file on an Apache webserver. Instead of
making all of my PDF files download, I created a separate folder on the
server just for the PDF files that don't display in the browser
properly, and I put the .htaccess file in that folder (so it doesn't
affect the rest of the site).Simply create a plain text file and name it
.htacc...