I would like to revive this year-old request, that I consider to be for a rudimentary feature. The pdf does not need to be indexed for queries. If it is highlight-able, copy-able, text, it should also be searchable via Command+F (even on mobile)
It would certainly be great to be able to search in PDFs but if it is not possible to do it inside Obsidian would it not be possible to force a link to a PDF to open in Preview or similar. I know you can set a hot key to open in default app, but you have to open in Obsidian first. Clicking a link to a .numbers file opens it in numbers, why not similar for PDF?