In which managed property is file content (e.g. text content of Word/PDF etc.) stored?

I try to demote results in which the search string is “only” inside the content of the file not a metadata (e.g. like “title”, “description”).

For example a PDF inside SharePoint with the title “xy” is fine (ranking should not be changed) but if “xy” is only inside of the text of the PDF or text of Excel/Word etc. then the ranking of such files should be demoted.

So I try to find out in which managed property the search crawler stores those values? Does anybody know? Is it “Contents”?