PDF parser not working

I tried the PDF download/parsing example here:
http://www.clips.ua.ac.be/pages/pattern-web#pdf

But ran into this issue:

Python 2.7.6 (default, Mar 22 2014, 22:59:56)
[GCC 4.8.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.

from pattern.web import URL, PDF
url = URL('http://www.clips.ua.ac.be/sites/default/files/ctrs-002_0.pdf')
pdf = PDF(url.download())
Traceback (most recent call last):
File "", line 1, in
File "/usr/local/lib/python2.7/dist-packages/Pattern-2.6-py2.7.egg/pattern/web/init.py", line 3775, in init
self.content = self._parse(path, format=output)
File "/usr/local/lib/python2.7/dist-packages/Pattern-2.6-py2.7.egg/pattern/web/init.py", line 3790, in _parse
raise PDFError(str(e))
pattern.web.PDFError: must be encoded string without NULL bytes, not str

Using latest version from Git under Ubuntu 14.04.

Cheers,
Tim

Start by reproducing the PDF example from the linked Pattern web documentation with the reported Python 2.7 environment. Inspect pattern/web/init.py around the PDF constructor at line 3775 and _parse at line 3790; done means the example parses the downloaded PDF without raising PDFError.