The original article pdf looks real as if it were scanned from someones scrap book yet I can grab the text in the pdf. I would have expected it to be a picture format, jpeg or such. Is it a manufactured document?
I don't know much about the technology, but you can perhaps find more info on the paper he supposedly wrote while a student at Columbia (College or University?) within the following Yahoo search results for "obama" "breaking the war mentality"
http://search.yahoo.com/search?p=%22obama%22breaking+the+war+mentality%22&ei=UTF-8&fr=yff35ck
New York Times:
http://documents.nytimes.com/obama-s-1983-college-magazine-article#p=1