diff --git a/package-lock.json b/package-lock.json
index 1ae08e4..12d94db 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1395,8 +1395,7 @@
     "ajv-keywords": {
       "version": "3.4.1",
       "resolved": "https://registry.npmjs.org/ajv-keywords/-/ajv-keywords-3.4.1.tgz",
-      "integrity": "sha512-RO1ibKvd27e6FEShVFfPALuHI3WjSVNeK5FIsmme/LYRNxjKuNj+Dt7bucLa6NdSv3JcVTyMlm9kGR84z1XpaQ==",
-      "dev": true
+      "integrity": "sha512-RO1ibKvd27e6FEShVFfPALuHI3WjSVNeK5FIsmme/LYRNxjKuNj+Dt7bucLa6NdSv3JcVTyMlm9kGR84z1XpaQ=="
     },
     "ansi-colors": {
       "version": "3.2.4",
@@ -1992,8 +1991,7 @@
     "big.js": {
       "version": "5.2.2",
       "resolved": "https://registry.npmjs.org/big.js/-/big.js-5.2.2.tgz",
-      "integrity": "sha512-vyL2OymJxmarO8gxMr0mhChsO9QGwhynfuu4+MHTAW6czfq9humCB7rKpUjDd9YUiDPU4mzpyupFSvOClAwbmQ==",
-      "dev": true
+      "integrity": "sha512-vyL2OymJxmarO8gxMr0mhChsO9QGwhynfuu4+MHTAW6czfq9humCB7rKpUjDd9YUiDPU4mzpyupFSvOClAwbmQ=="
     },
     "binary-extensions": {
       "version": "1.13.1",
@@ -3258,8 +3256,7 @@
     "emojis-list": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/emojis-list/-/emojis-list-3.0.0.tgz",
-      "integrity": "sha512-/kyM18EfinwXZbno9FyUGeFh87KC8HRQBQGildHZbEuRyWFOmv1U10o9BBp8XVZDVNNuQKyIGIu5ZYAAXJ0V2Q==",
-      "dev": true
+      "integrity": "sha512-/kyM18EfinwXZbno9FyUGeFh87KC8HRQBQGildHZbEuRyWFOmv1U10o9BBp8XVZDVNNuQKyIGIu5ZYAAXJ0V2Q=="
     },
     "encodeurl": {
       "version": "1.0.2",
@@ -5473,7 +5470,6 @@
       "version": "1.4.0",
       "resolved": "https://registry.npmjs.org/loader-utils/-/loader-utils-1.4.0.tgz",
       "integrity": "sha512-qH0WSMBtn/oHuwjy/NucEgbx5dbxxnxup9s4PVXJUDHZBQY+s0NWA9rJf53RBnQZxfch7euUui7hpoAPvALZdA==",
-      "dev": true,
       "requires": {
         "big.js": "^5.2.2",
         "emojis-list": "^3.0.0",
@@ -5484,7 +5480,6 @@
           "version": "1.0.1",
           "resolved": "https://registry.npmjs.org/json5/-/json5-1.0.1.tgz",
           "integrity": "sha512-aKS4WQjPenRxiQsC93MNfjx+nbF4PAdYzmd/1JIj8HYzqfbu86beTuNgXDzPknWk0n0uARlyewZo4s++ES36Ow==",
-          "dev": true,
           "requires": {
             "minimist": "^1.2.0"
           }
@@ -5716,8 +5711,7 @@
     "minimist": {
       "version": "1.2.5",
       "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.5.tgz",
-      "integrity": "sha512-FM9nNUYrRBAELZQT3xeZQ7fmMOBg6nWNmJKTcgsJeaLstP/UODVpGsr5OhXhhXg6f+qtJ8uiZ+PUxkDWcgIXLw==",
-      "dev": true
+      "integrity": "sha512-FM9nNUYrRBAELZQT3xeZQ7fmMOBg6nWNmJKTcgsJeaLstP/UODVpGsr5OhXhhXg6f+qtJ8uiZ+PUxkDWcgIXLw=="
     },
     "mississippi": {
       "version": "3.0.0",
@@ -5855,6 +5849,11 @@
         "tslib": "^1.10.0"
       }
     },
+    "node-ensure": {
+      "version": "0.0.0",
+      "resolved": "https://registry.npmjs.org/node-ensure/-/node-ensure-0.0.0.tgz",
+      "integrity": "sha1-7K52QVDemYYexcgQ/V0Jaxg5Mqc="
+    },
     "node-forge": {
       "version": "0.9.0",
       "resolved": "https://registry.npmjs.org/node-forge/-/node-forge-0.9.0.tgz",
@@ -6355,6 +6354,15 @@
         "sha.js": "^2.4.8"
       }
     },
+    "pdfjs-dist": {
+      "version": "2.3.200",
+      "resolved": "https://registry.npmjs.org/pdfjs-dist/-/pdfjs-dist-2.3.200.tgz",
+      "integrity": "sha512-+8wBjU5h8LPZOIvR9X2uCrp/8xWQG1DRDKMLg5lzGN1qyIAZlYUxA0KQyy12Nw5jN7ozulC6v97PMaDcLgAcFg==",
+      "requires": {
+        "node-ensure": "^0.0.0",
+        "worker-loader": "^2.0.0"
+      }
+    },
     "performance-now": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/performance-now/-/performance-now-2.1.0.tgz",
@@ -9275,6 +9283,26 @@
         "errno": "~0.1.7"
       }
     },
+    "worker-loader": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/worker-loader/-/worker-loader-2.0.0.tgz",
+      "integrity": "sha512-tnvNp4K3KQOpfRnD20m8xltE3eWh89Ye+5oj7wXEEHKac1P4oZ6p9oTj8/8ExqoSBnk9nu5Pr4nKfQ1hn2APJw==",
+      "requires": {
+        "loader-utils": "^1.0.0",
+        "schema-utils": "^0.4.0"
+      },
+      "dependencies": {
+        "schema-utils": {
+          "version": "0.4.7",
+          "resolved": "https://registry.npmjs.org/schema-utils/-/schema-utils-0.4.7.tgz",
+          "integrity": "sha512-v/iwU6wvwGK8HbU9yi3/nhGzP0yGSuhQMzL6ySiec1FSrZZDkhm4noOSWzrNFo/jEc+SJY6jRTwuwbSXJPDUnQ==",
+          "requires": {
+            "ajv": "^6.1.0",
+            "ajv-keywords": "^3.1.0"
+          }
+        }
+      }
+    },
     "wrap-ansi": {
       "version": "5.1.0",
       "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-5.1.0.tgz",
diff --git a/package.json b/package.json
index 4d15a2a..97a4131 100644
--- a/package.json
+++ b/package.json
@@ -25,6 +25,7 @@
     "formidable": "1.*",
     "fs-extra": "7.*",
     "jsdom": "^14.0.0",
+    "pdfjs-dist": "^2.3.200",
     "socket.io": "2.*",
     "webdav": "^2.8.0"
   },