if you reply to comments instead of editing your original post it makes it easier to read.
Large parts of this document size is due to other pdfs inside the top-level pdf, along with source code to PoC and exploits ... even whole sections of Kant's philosophy (not part of the top level pdf as html) (see my post on https://blog.valbonne-consulting.com/2017/11/01/what-kant-ca...) ... IMO what you removed was the envelope and threw the actual letter away.
Large parts of this document size is due to other pdfs inside the top-level pdf, along with source code to PoC and exploits ... even whole sections of Kant's philosophy (not part of the top level pdf as html) (see my post on https://blog.valbonne-consulting.com/2017/11/01/what-kant-ca...) ... IMO what you removed was the envelope and threw the actual letter away.