How to detect partial garbled text? <img width="1694" height="576" alt="Image" src="https://github.com/user-attachments/assets/c24ce135-49c5-4d37-9325-fa1dc07983c8" /> [部分乱码-1.pdf](https://github.com/user-attachments/files/22794689/-1.pdf)
How to detect partial garbled text?
部分乱码-1.pdf