Geospatial PDFs are a common format for offline maps and now they're supported in ArcGIS Field Maps. Read all about how you can put PDFs to work in this ArcGIS blog article:
I am the Group Product Engineering Lead for our Field Apps team at Esri. I work with an amazing team building out our field solutions.
Please feel free to ask me anything about ArcGIS Field Maps, Workforce, and Navigator.