An office worker; one who works in an office and deals with forms and reports all day; one whose work is dull and without meaning.
Office workers deal with a lot of paper -- forms, reports, letters, memos, etc. And some workers simply move all that paper from one place to another, pushing the paper from desktop to drawer and back again.
1) I'm not sure exactly what my brother does, but I know he's a paper pusher at some huge, faceless company.
2) Ted retired to Florida after putting in 30 years as a paper pusher at Greedie Corp.