This may be a bit late.
You can change the settings before printing to tell ACAD not to include layer information. Go to Plot, Click properties for the PDF printer you use. (I use DWG to PDF) Click custom Properties, The custom properties at the bottom of the Tab. Then Additional output settings untick "Include Layer information" I also tick Capture all Fonts to avoid any compatability issues, but this may increase the file size slightly.
Brian