putro
--- a/wp-mat.php
+++ b/wp-mat.php

    // Check if the mime type is one of those we want to clean up.
    // Use a blacklist, currently empty. Send everything by default
-    // except video.
+    // except video, and pdf.
    function is_supported_mime_type($mimetype) {
        if (substr($mimetype, 0, 6) === "video/") {
            return false;
+        if (substr($mimetype, 0, 15) === "application/pdf") {