diff --git a/qutebrowser/utils/version.py b/qutebrowser/utils/version.py
index 7e5a185da..e96be6131 100644
--- a/qutebrowser/utils/version.py
+++ b/qutebrowser/utils/version.py
@@ -19,6 +19,7 @@
 
 """Utilities to show various version informations."""
 
+import re
 import sys
 import glob
 import os.path
@@ -34,6 +35,7 @@ from PyQt5.QtWidgets import QApplication
 
 import qutebrowser
 from qutebrowser.utils import log, utils
+from qutebrowser.browser import pdfjs
 
 
 GPL_BOILERPLATE = """
@@ -183,6 +185,25 @@ def _os_info():
     return lines
 
 
+def _pdfjs_version():
+    """Get the pdf.js version.
+
+    Return:
+        A string with the version number.
+    """
+    try:
+        pdfjs_file = pdfjs.get_pdfjs_res('build/pdf.js').decode('utf-8')
+    except pdfjs.PDFJSNotFound:
+        return 'no'
+    else:
+        version_re = re.compile(r"^PDFJS\.version = '([^']+)';$", re.MULTILINE)
+        match = version_re.search(pdfjs_file)
+        if not match:
+            return 'unknown'
+        else:
+            return match.group(1)
+
+
 def version(short=False):
     """Return a string with various version informations.
 
@@ -211,6 +232,7 @@ def version(short=False):
         lines += _module_versions()
 
         lines += [
+            'pdf.js: {}'.format(_pdfjs_version()),
             'Webkit: {}'.format(qWebKitVersion()),
             'Harfbuzz: {}'.format(os.environ.get('QT_HARFBUZZ', 'system')),
             'SSL: {}'.format(QSslSocket.sslLibraryVersionString()),
diff --git a/tests/unit/utils/test_version.py b/tests/unit/utils/test_version.py
index 3ad45ce34..f8c1a88e3 100644
--- a/tests/unit/utils/test_version.py
+++ b/tests/unit/utils/test_version.py
@@ -34,6 +34,7 @@ import pytest
 
 import qutebrowser
 from qutebrowser.utils import version
+from qutebrowser.browser import pdfjs
 
 
 class GitStrSubprocessFake:
@@ -529,6 +530,39 @@ class TestOsInfo:
         version._os_info()
 
 
+class TestPDFJSVersion:
+
+    """Tests for _pdfjs_version."""
+
+    def test_not_found(self, mocker):
+        mocker.patch('qutebrowser.utils.version.pdfjs.get_pdfjs_res',
+                     side_effect=pdfjs.PDFJSNotFound)
+        assert version._pdfjs_version() == 'no'
+
+    def test_unknown(self, monkeypatch):
+        monkeypatch.setattr('qutebrowser.utils.version.pdfjs.get_pdfjs_res',
+                            lambda path: b'foobar')
+        assert version._pdfjs_version() == 'unknown'
+
+    def test_known(self, monkeypatch):
+        pdfjs_code = textwrap.dedent("""
+            // Initializing PDFJS global object (if still undefined)
+            if (typeof PDFJS === 'undefined') {
+              (typeof window !== 'undefined' ? window : this).PDFJS = {};
+            }
+
+            PDFJS.version = '1.2.109';
+            PDFJS.build = '875588d';
+
+            (function pdfjsWrapper() {
+              // Use strict in our context only - users might not want it
+              'use strict';
+        """).strip().encode('utf-8')
+        monkeypatch.setattr('qutebrowser.utils.version.pdfjs.get_pdfjs_res',
+                            lambda path: pdfjs_code)
+        assert version._pdfjs_version() == '1.2.109'
+
+
 class FakeQSslSocket:
 
     """Fake for the QSslSocket Qt class.
@@ -571,6 +605,7 @@ def test_version_output(git_commit, harfbuzz, frozen, short, stubs,
         'qVersion': lambda: 'QT RUNTIME VERSION',
         'PYQT_VERSION_STR': 'PYQT VERSION',
         '_module_versions': lambda: ['MODULE VERSION 1', 'MODULE VERSION 2'],
+        '_pdfjs_version': lambda: 'PDFJS VERSION',
         'qWebKitVersion': lambda: 'WEBKIT VERSION',
         'QSslSocket': FakeQSslSocket('SSL VERSION'),
         'platform.platform': lambda: 'PLATFORM',
@@ -613,6 +648,7 @@ def test_version_output(git_commit, harfbuzz, frozen, short, stubs,
             Desktop: DESKTOP
             MODULE VERSION 1
             MODULE VERSION 2
+            pdf.js: PDFJS VERSION
             Webkit: WEBKIT VERSION
             Harfbuzz: {harfbuzz}
             SSL: SSL VERSION