Deciding whether text can be extracted from a PDF or if OCR is required

Hi all, I'm scanning invoices and uploading them to Drive. When I try to use "Extract From File" the extracted text is meaningless, so I'd like to use an OCR service.

Other than trying to understand whether or not the text is meaningful or not using text tools or AI, is there another, more simple way, to deciding if a PDF is extractable or not?

(PS: I know I've seen a solution for this already but I can't find it...)

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