We have found one software suitable in our database for this conversion.
You can find various PDF tools that should be capable of recovering the original documents and saving them in their original format. So programs, such as Able2Extract can help you in exporting MS Publisher documents (.pub) from PDF documents (.pdf). This will of course only work on PDFs that were made in Publisher.
Updated: February 14, 2022
PDF
A pdf file extension is mainly used for Adobe Portable document format, commonly referred to as PDF. All programs that create some sort of documents or projects offer the possibility to export their format to PDF format. A free PDF viewer (Adobe Reader) is available for download from Adobe website.
PUB
Files with pub extension are in most cases documents created in Microsoft Publisher, a desktop publishing application from Microsoft Office suite. PUB documents are much more complex than common Word files and give more emphasis to design and page layout, rather than actual text.