Jennfer, there is no such tag as the "noindex, nofollow" tag that is put into an a href link.
You should add the "follow" link attribute to the link, and then use the robots.txt file to be sure that it's not indexed.
An alternative would be to require that someone fill in a form (and collect their contact information) then they will get access to the PDF file. Or, you could then email it to them.
SEO since 1996, I've been doing internet marketing. I have the experience as an SEO expert
, as well.