Not a dumb question; there's nothing in the obvious instructions for the Reader that makes it clear how it reads PDFs.
The Reader checks the author & title listed in the PDF's metadata, not the filename. You can edit this with Acrobat Professional, or with a free program like
BeCyPDFMetaEdit 2.37.0.
There might be a way to set the title/author when you create the PDF, depending on the method you use. (Do you print to PDF, or save it out first & use a program to convert it?)
Sometimes I copy a webpage, paste it into Word, set the the title & author under File-->Properties, and change the page size to something that shows up well in the Reader before converting to PDF.