Unfortunately using the raw_content method is unlikely to help with
the vast majority of PDFs.
Are you trying to extract text from specific sections of a page,
rather than the entire page?
pdf-reader doesn't support that out of the box. If you want to explore
writing custom code to do it, the `PDF::Reader::PageTextReceiver`
class is 80% of the way there. The missing piece is providing a way to
specify the bounding box you're interested in and ignoring any
characters outside it.
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