diff --git a/client/src/app/site/mediafiles/models/view-mediafile.ts b/client/src/app/site/mediafiles/models/view-mediafile.ts
index eb1a10b2e..d63cb8438 100644
--- a/client/src/app/site/mediafiles/models/view-mediafile.ts
+++ b/client/src/app/site/mediafiles/models/view-mediafile.ts
@@ -46,6 +46,22 @@ export class ViewMediafile extends BaseViewModel {
         return this.mediafile ? this.mediafile.getDownloadUrl() : null;
     }
 
+    /**
+     * @returns the file type of the associated media file.
+     */
+    public get fileType(): string {
+        return this.mediafile ? this.mediafile.mediafile.type : null;
+    }
+
+    /**
+     * Determines if the file has the 'hidden' attribute
+     * @returns the hidden attribute, also 'hidden' if there is no file
+     * TODO Which is the expected behavior for 'no file'?
+     */
+    public get is_hidden(): boolean {
+        return this.mediafile ? this.mediafile.hidden : true;
+    }
+
     public constructor(mediafile?: Mediafile, uploader?: User) {
         super();
         this._mediafile = mediafile;
@@ -120,8 +136,4 @@ export class ViewMediafile extends BaseViewModel {
             this._uploader = update;
         }
     }
-
-    public is_hidden(): boolean {
-        return this._mediafile.hidden;
-    }
 }
diff --git a/client/src/app/site/mediafiles/services/mediafile-filter.service.ts b/client/src/app/site/mediafiles/services/mediafile-filter.service.ts
index d59a8165d..b96e436f8 100644
--- a/client/src/app/site/mediafiles/services/mediafile-filter.service.ts
+++ b/client/src/app/site/mediafiles/services/mediafile-filter.service.ts
@@ -1,6 +1,6 @@
 import { Injectable } from '@angular/core';
 
-import { FilterListService } from '../../../core/services/filter-list.service';
+import { FilterListService, OsFilter } from '../../../core/services/filter-list.service';
 import { Mediafile } from '../../../shared/models/mediafiles/mediafile';
 import { ViewMediafile } from '../models/view-mediafile';
 import { StorageService } from 'app/core/services/storage.service';
@@ -12,7 +12,7 @@ import { MediafileRepositoryService } from './mediafile-repository.service';
 export class MediafileFilterListService extends FilterListService<Mediafile, ViewMediafile> {
     protected name = 'Mediafile';
 
-    public filterOptions = [
+    public filterOptions: OsFilter[] = [
         {
             property: 'is_hidden',
             label: 'Hidden',
@@ -20,17 +20,25 @@ export class MediafileFilterListService extends FilterListService<Mediafile, Vie
                 { condition: true, label: 'is hidden' },
                 { condition: false, label: 'is not hidden', isActive: true }
             ]
+        },
+        {
+            property: 'fileType',
+            label: 'Is PDF',
+            options: [
+                {
+                    condition: 'application/pdf',
+                    label: 'is PDF file'
+                },
+                {
+                    condition: null,
+                    label: 'Is no PDF file'
+                }
+            ]
         }
-        // , { TODO: is_pdf is not yet implemented on mediafile side
-        //     property: 'is_pdf', isActive: false, label: 'PDF',
-        //     options: [
-        //         {condition: true, label: 'is a PDF'},
-        //         {condition: false, label: 'is not a PDF'}
-        //     ]
-        // }
     ];
 
     public constructor(store: StorageService, repo: MediafileRepositoryService) {
         super(store, repo);
+        this.updateFilterDefinitions(this.filterOptions);
     }
 }
diff --git a/client/src/app/site/mediafiles/services/mediafiles-sort-list.service.ts b/client/src/app/site/mediafiles/services/mediafiles-sort-list.service.ts
index 8f4d1d659..07a34a078 100644
--- a/client/src/app/site/mediafiles/services/mediafiles-sort-list.service.ts
+++ b/client/src/app/site/mediafiles/services/mediafiles-sort-list.service.ts
@@ -9,13 +9,7 @@ export class MediafilesSortListService extends SortListService<ViewMediafile> {
     public sortOptions: OsSortingDefinition<ViewMediafile> = {
         sortProperty: 'title',
         sortAscending: true,
-        options: [
-            { property: 'title' },
-            { property: 'type' },
-            { property: 'size' },
-            // { property: 'upload_date' }
-            { property: 'uploader' }
-        ]
+        options: [{ property: 'title' }, { property: 'type' }, { property: 'size' }]
     };
     protected name = 'Mediafile';
 }