Google's Gary Illyes said in the comments section of this Google+ post that links within Adobe PDF documents do pass PageRank.
Also, Google said so in this blog post from 2011 "generally links in PDF files are treated similar to links in HTML: they can pass PageRank and other indexing signals, and we may follow them after we have crawled the PDF file.”
Links in .pdf documents will be displayed in your Google Webmaster Tools Backlinks, they will accumulate PageRank and even pass this on.
It is a good idea to place links into .pdf documents that you give away on the web not only for PageRank reasons but also to give users an easy link to visit your site for more information. Think about usability when you create .pdf documents in the same ways that you think about usability for your website.
Also, if you complete the "properties" attributes of .pdf documents you can give them a title that will appear in the SERPs like a title tag on an .html webpage.
Finally in addition to .pdf documents you can also get viable backlinks and clickthroughs from .ppt (PowerPoint) .xls (Excel) and other types of files. Consider allowing other webmasters to include them on their site. That way they can bring you links from other domains.
Also, you can hire an affordable SEO company to build high quality backlinks for your website to improve the visibility of your website in SERP.
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