I just discovered that when I export a PDF from Designer, it creates a "title" of the page which is the file path to where I save it and this is embedded in the PDF. I can get rid of it by opening Acrobat and removing it, but that is cumbersome.
I don't want people seeing this information on publicly distributed PDFs.
I've attached a screen shot of the "Properties" panel in Acrobat which shows the title attached with the PDF when exported from Designer.