Adobe Acrobat PDF (.pdf)
I try to search .pdf file in .edu site here
Here is the result :

Microsoft Word (.DOC)
Find it here.
Capture :

Hypertext Markup Language HTML (.html)
Find about SEO Abstract here
Capture :

Rich Text Format RTF (.rtf)
Find it here
Capture :

Adobe PostScript (.ps)
Find about SEO in PS file here
Capture :

Google has mention about show metadata here :

Google started to integrate in the search results information about the scientific papers included in Google Scholar. Below the snippet, Google lists the authors, the number of citations and links to related articles and other versions available online. The integration is not perfect and the search results look cluttered, but it’s yet another class of results that have richer snippets.

Now the question is, does all info in that format file have any significant effect on ranking?