How to print Apple Wallet to PDF. PKPASS to PDF conversion options.
Most users looking for pkpass to pdf conversion usually want a printable version of their Apple Wallet / Passbook tickets (.pkpass files). Unfortunately, no such program for printing pkpass to PDF exists, and some most likely go for some online passbook converter.
You can open your .pkpass files in the default app on iPhone (Apple Wallet). However, services based on Apple Wallet / Passbook usually provide users with PDF files in confirmation e-mails and the possibility to print additional PDF tickets from the user's account. Unfortunately, there is no official alternative for this on other platforms or devices, so you will have to look for 3rd party solutions.
Last but not least, a .pkpass file is just a renamed ZIP file that you can decompress in Windows (rename the file suffix to recognize it). If you do that, you can usually find a .png with the ticket inside, and you can print that to PDF easily.
A digital pass managing utility integrated in iOS 6 and above
A digital pass managing app for Mac