Try Chessvision.ai eBook Reader. It makes chess PDFs interactive so that you can double-click any diagram to instantly load it into an analysis board.
Available on multiple platforms:
- Browser App: https://ebook.chessvision.ai/
- iOS App: https://apps.apple.com/us/app/chessvision-ai-ebook-reader/id6599857782
- Android App: https://play.google.com/store/apps/details?id=ai.chessvision.reader
Disclaimer: I'm the creator, so feel free to reach out with any questions!
CBV is the Chessbase format.