The standard WordPress search is pretty basic and only search the database, there are some plugins that extend the search functionality to search even more parts of the database like:
but they do not have the ability to search files.
There is one plugin that i know of that claims to support indexing PDF and DOC files
- Sphider for WordPress
which is a bit outdated and i have tried before so you might want to check it out.
But the best solution I have used for this kind of “Job” is Google custom search
that searchs PDFs and DOCs and is fairly easy to set up.
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