In Jainism, forests are seen as places for austerity and self-discipline, not for committing harm. The idea of “doing bad in the forest” isn’t a standard theme. Instead, wrongdoing is defined by violating the five Mahavratas (or the five Great Vows) and causing harm to living beings, lying, stealing, improper sexual conduct, or attachment/aversion.

If you are asking about a particular story or scripture where an act of harm occurs in a forest, please share the text or context (e.g., which Jain scripture or story you have in mind), and I can explain the exact meaning (arth) according to Digambar or Shwetambar traditions.