Search and replace url inside of pdf or word document in DAM

Hi,

We have migrated the CQ5.4 to AEM 5.6.1 and our publish server is changed too (https://old_publish_server.com/content/...  ->  https://new_publish_server.com/content/...).

There are thousands of PDF/DOC files that may contain the links pointing to the old publish server. Is there an efficient way (or scripts) to do the global search and replace the old url with the new one?

Thanks in advance

Jim