when you purchase QuarkXPress 2017 (an upgrade, a new license, a Competitive Upgrade from Photoshop, a government version or a non-profit version) now, you will receive pdfToolbox for free.
pdfToolbox is a PDF editing and PDF pre-flight tool, maybe the only professional alternative to Acrobat Pro?
More details here:
http://content.quark.com/pdftoolbox-bundle-us.html
Thanks
Matthias