Depends on the job... I applied to a bunch of law firms last year and it is common to send things via PDF (of course, I didn't have any way of converting my application from word into pdf, so I sent it as a word document anyways!).
Also, if you have to send a copy of your transcripts, etc. a pdf might make the file smaller (I scanned my transcripts and added the image into the word document... needless to say, a couple of full size, high-res photos made the document very large).
If you are sending it to an office type job, either should be fine... just be sure to put something in the body of the email (as you've done above) so the reader knows what they are receiving.
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