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Invalid multiple signature on specific PDF document

On some specific PDF documents (sample attached), multiple signatures are rendered as invalid. Adobe Reader says "SigDict /Contents illegal data". The only valid signature is the last one. This bug only happened on specific document, but works fine on others. We have a valid license key.

Steps to reproduce:

  1. Open the attached sample project
  2. Fill the license key variable
  3. Run the project
  4. Check the signatures on GIBTHA-signed2.pdf file (inside doc folder), Adobe says invalid
  5. Change "filename" variable to "NILAI"
  6. Run again
  7. Check the signatures on NILAI-signed2.pdf file (inside doc folder), Adobe says valid

We don't know if this is a bug in the Syncfusion PDF library or the PDF document itself. 

Any help would be greatly appreciated.