Document metadata API Issue

Hello All

Can you help me out weather we can able to get filling pdf document in JSON format?

I am interested to get metadata from the PDF format in JSON to store the financial values in Salesforce.

If there is a way can you please tell me the process of getting JSON response of metadata from PDF?

No, this is not possible.
The PDFs are images.
Accounts that are filed as xhtml/ixbrl are available and you could extract the values from those with suitable tools.