One of my clients writes cookbooks. Some time ago, he wrote an article about the origins of Boston Cream Pie, which he has on his site as a PDF on a page of links to various articles he has written.
I would like to share that PDF on Facebook, but the PDF doesn't give Facebook any Open Graph tags, so the link is rather ugly
Is there an Open Graph implementation for PDF URLs that would give his readers a good social media link besides creating a new page with text and images that are more Open Graph friendly?