How to get PDF content searchable

ALWAYS MAKE SURE YOU ARE USING THE LAST GA VERSION
New PDF format & types are most likely supported in the latest Search & Preview version

• If you are not up-to-date, upgrade asap
  

Another reason why it is not possible to search for the content of PDF files is that a proper PDF iFilter is not installed, out of date or configured incorrectly.

• If you are not up-to-date, upgrade asap
  

PDF FILE ANNALYSE
A reason to why PDF files do not show up in search results is that they can’t be indexed due to the fact that they contain graphical images of text instead of an actual text “readable” by SharePoint.

Easy to use tip:
(this helps in most cases to visual see if your pdf file are content searchable or not)

• You can verify if that is the case by using a Tool as Adobe Reader to select individual words or letters in the document.
• If instead of individual word selection you get a rectangular selection area, the document in question is not searchable.

SOLUTION
If you verify that this is the case and still want to make these files searchable, you can perform Optical Character Recognition (OCR) on these files and then save them as textual PDFs.
The procedure in extreme cases may require printing out current documents, scanning them with OCR enabled software and then saving them into correct PDF format.