Check out some options how pkpass files might be converted to pdf format.
A pkpass to pdf conversion is often sough by users that try to get their Apple Wallet / Passbook tickets (.pkpass files) or other invoices in PDF format (.pdf files). You most likely won't find a simple passbook converter or pkpass iphone app that can convert pkpass files to pdf or anything else.
However, services based on Apple Wallet / Passbook usually provide users with PDF files in confirmation e-mails, as well as the possibility to print additional PDF ticket from the users account.
You can open your own .pkpass files in the default app on iPhone (Apple Wallet), unfortunately there is no official alternative for this on other platforms or devices so you will have to look for 3rd party solutions.
Worth mentioning is also the fact that a .pkpass is essentially just renamed ZIP archive, so if you decompress it, you can find a .png picture (or its thumbnail preview at least) with the ticket inside. You can print that picture as PDF should you really want to.
Updated: April 13, 2017
Unfortunately, there is no detailed software record in the database for this conversion.
Articles and other information relating to pkpass into pdf conversion:
How to open pkpass file - Additional information about pkpass files and how to open and convert them
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