Instead of running standard OCR, use Acrobat's optimization tools to clean the file first. Go to > Scan & OCR > Enhance . Select Scanned Document .
: While Acrobat can recognize handwriting, it must be reasonably neat; messy handwriting often causes OCR errors. adobe acrobat dc ocr fix
Acrobat may try to map recognized text to a corrupt system font. Instead of running standard OCR, use Acrobat's optimization
Troubleshooting Adobe Acrobat DC OCR: How to Fix Common Errors Instead of running standard OCR
If you have applied every listed above and Acrobat still fails, the issue is likely Adobe's own limited OCR tolerance for highly degraded documents. Do not despair. You have two options: