Adobe Acrobat does not produce nor generates Visual Basic for Applications (VBA) Macros of any kind.
Macros are a programming platform of the Microsost Office family of programs.
You may need to check how MS Outlook is currently configured in order to find out the reason of why such Macros are generated when you attach a PDF file in your emails using MS Outlook.
But most important, not all PDF viewers render a PDF file correctly. So whatever your users are trying to open the PDF with is really out of your control except for encouraging them to download and install Adobe Reader DC.