A PDF with a good quality external link could affect the authority of that domain?

[overalia]

Here I go with a situation:

You have an isolated PDF hosted in your domain, the PDF has none internal backlinks (neither links to another page on the domain) but has a really good external backlink from a domain with high authority. Do you think that the backlink has influence on the global domain authority and the domain rankings?

Thanks!

[overalia]

Thanks for the answer Greg.

The key is that the PDF would be added and linked by users and not by us. If we develope a specific feature in a client online service we might earn some quality backlinks for their domain but only to an isolated PDFs.

[GPainter]

Google can read PDF's and its valuable content it should help benefit your domain, may be better to have the content on site with a pdf download option perhaps.. realistically with the lack of internal links i doubt it's going to change that much but will help add to your link portfolio which is good.

hope that helps.