Got a strange behavior with some spec sheets: those pdf files placed in a SharePoint 2013 Foundation library are crawled successfully but not all content can be searched in the end. There is an order number inside the files which is significant for searching. But this data can't be searched - no results whereas all the other parts of the pdf can be searched. Searching nearby this order number the results page shows the order no in the further information block of the hit. Opening the original pdf the order number can be marked by the text tool so it seems really to be text. Specially formatted string? Duno. :-/
How to find out whether the SP search or the pdf is guilty of this failure?