Now and then I come across a PDF which looks fine in first place but the underlying text is garbled. Currently I have a PDF where only the headings are garbled and I would like to know if it's possible to somehow replace the garbled text with the correct one.
I thought about OCRing the specific pages but this only works if I convert the page to an image.
How can I manually correct the underlying text or the re-OCR only specific parts?