How do I run this?
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1) Do a git clone to "pdfxray" - the project won't work if your folder holding the source is not labeled this (blame django).
2) Download the following items:

django - https://www.djangoproject.com/
django-pagination - http://code.google.com/p/django-pagination/
python setuptools - http://pypi.python.org/pypi/setuptools
python matplotlib - pulled from ubuntu repos
mongo - http://www.mongodb.org/display/DOCS/Ubuntu+and+Debian+packages
mysql - pulled from ubuntu repos
python-mysqldb - pulled from ubuntu repos
pymongo - https://github.com/mongodb/mongo-python-driver
python ghostscript - http://pypi.python.org/pypi/ghostscript
python-simplejson - http://pypi.python.org/pypi/simplejson/

3) Fill in the settings with your database information for mysql
4) Add to your Apache Site settings - WSGIScriptAlias / /var/www/pdfxray/django.wsgi
5) Run a python manage.py syncdb
6) Should be good to go

Is this the same copy from PDFXRAY.com?
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Indeed

Are there any catches to all of this?
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No, but you should share. Sharing is caring.