IFD or tags offsets pointing outside the file or inside the Image File Header, or reused offsets (offset points or overlapping to already used data).
With an Hexadecimal Editor (e.g. HxD) change the offset of a tag and set it to an invalid number.
- A value between 0 and 7 which corresponds to the TIFF header.
- A value greater than the file size.
- The same value for two different tags.