I have a very similar project where I’ve extracted text and tables from over 1mm PDF filings in large bankruptcy cases - bankrupt11.com

I still haven’t found a good way of paragraph detection. Court filings are double spaced, and the white space between paragraphs is the same as the white space between lines of text. I also can’t use tab characters because of chapter headings and lists which don’t start with a <tab>. I was hoping to get some help from anyone who has done it before.