Another popular tip from 2011 was How to find out if Google can get the text from your PDF documents, a quick method of analysing your PDF data sheets and brochures to see what the search engines can extract from them. Some people are surprised to find that there’s nothing at all, although that’s usually because the original document was just a scanned-in image which is then presented as a PDF. You need Google to be able to read your PDF files and to include them in its search results, just as you also need the files to have good titles and other “meta data”, as we’ve discussed on numerous occasions here. If you can’t re-work a document with no obvious data which Google can understand, then put a cover sheet on it with a good synopsis of the content, and re-save it. Any competent graphic designer with a copy of Adobe Acrobat should be able to help you out with that one.
Read How to find out if Google can get the text from your PDF documents, March 2011