Hello Mike P,
No, the web version doesn't work either. The PDF's are from one source, a Russian company, but all in English. There is a link in the PDF to a site to check the digital signature on the document, perhaps that is causing problem? Adobe and Edge have no problem with the files, and neither does Evernote when searching within the note. It's just that nothing shows up if I use the main search function. Not if I select start or the folder where the notes with the PDF's are.