Is there any method of highlighting, adding a comment to document with adobe reader?
If Asking About Adding A Comment,
Then It's Possible In Adobe Reader.
But Any Type Of Editing Of PDF Files Through Adobe Reader Is Not Possible.
For Those Editing U May Try Out Other 3rd Party Softwares.
You can also try out PDFXCView available from here. Though in terms of download size, Foxit Reader is a lighter option.
If you want to add comment in PDF files, try Foxit Reader freeware. I just tried to add a note in PDF file and it added in just a single click. More details are at http://www.computers.helpof.com/foxit-reader-for-windows-free-pdf-reader/
As far as I am aware there are no such features in Adobe Reader (also explained in Adobe FAQ page).