You're likely referring to the of the game O Caminho dos Reis (The Path of the Kings), not a standard PDF.
The most interesting feature is its format — a digital-only interactive document that presents the history of the Kingdom of Portugal through a continuous, illustrated vertical scroll. O Caminho Dos Reis Pdf
Would you like a summary of how to access the genuine interactive version instead of a PDF copy? You're likely referring to the of the game