Take your icon game to the next level. Check out Fonticons, from the maker of Font Awesome.

fa-file-pdf-o · Unicode: f1c1 · Created: v4.1 · Categories: Web Application Icons, File Type Icons

After you get up and running, you can place Font Awesome icons just about anywhere with the <i> tag:

<i class="fa fa-file-pdf-o"></i>

Looking for more? Check out the examples.