title: WordPress REST API - Get media of specific type only
body: <p>I am using WP REST API v1.2.5 (as v2 doesn't seem to work on the website I'm working on) and I want to retrieve all pdf objects from Media without getting all the other images, videos etc. How could I do this (without adding a custom endpoint if possible).</p>
  
  <p>to get all media I use:</p>
  
  <pre><code>/wp-json/media
  </code></pre>
  
  <p>I can't find a filter that would only return the pdfs on my site though. Any help would be appreciated. Thanks!</p>