Received .PDF files which when opened are in "Western European Windows" and are just gibberish. I have adobe 10.0.01 installed now. Can you help please in how to correct this Thanks

I received three files in Microsoft Outlook in a PDF format. When I clicked on open I got a window showing "Opening Mail Attchment" and only open from "trusted" sources. After opening it displayed a window for File conversion with Windows as the default with Western European( Windows) as I assume the font. The file was shown but had essentially meaningless characters and numbers with maybe the occasional meaningful word. There seems no way to understand why this happened or to correct it. Can you help please