You have to essentially render the document yourself in order to figure out what the order of chunks is. Then you might be able to extract content from the chun

You have to essentially render the document yourself in order to figure out what the order of chunks is. Then you might be able to extract content from the chunks you're interested in - or not. A given zipped chunk might be literally anything. Didier Stevens is the best expert of PDFs that I know of: https://blog.didierstevens.com/programs/pdf-tools/ https://blog.didierstevens.com/programs/pdf-tools/