PDF has the "Can not be modified" feature in many cases, the user, but only simple copy and paste is not very good to the content of the diagram and so completely copied to word, in the upcoming new version of Word added "PDF reflow" feature, Be able to directly and completely save the contents of the PDF file to Word for modification edits.
Traditional copy replication does not restore PDF documents very well
Goal
The goal of PDF Reflow is to translate the original layout of a PDF file into a Word document in a true and correct way. In other words, the converted Word document will be the same as a PDF document, and the converted Word document can be edited correctly.
This does not mean that all PDF files can be converted to word for editing, such as using a slide-converted PDF file to be converted to a Word document, only as a picture, and you can't edit the text of the slide.