PDF metadata not captured when file is saved sharepoint application

I have a document library in sharepoint site and it contain pdf documents. Documents has 10 metadata including document number. Document number is auto generate unique ID for each file. When i save the pdf in my local I see that pdf does not capture the metadata filled. I want to re-use those metadata when re-uploading somewhere else. This metadata get captured for word document but not for pdf. Can someone help me with that how i can acheive this either by c# or javascript of some OOB feature. Thanks