hacnho/keras-upsampling2d-scale-trigger-poc

Keras UpSampling2D scale trigger PoC

Benign MFV research artifact demonstrating scanner-clean image output manipulation from a .keras model file.

• Control: upsampling2d_scale_control.keras
• Malicious: upsampling2d_scale_trigger.keras
• Trigger: top-left and bottom-right input cells are bright; UpSampling2D expands them into the positive output cells
• Load path: keras.models.load_model(..., safe_mode=True)
• Inference path: model(image, training=False)

Local Probe Summary

• trigger_diagonal_cells -> control 0.00000000 / malicious 0.98201376
• all_zero -> control 0.00000000 / malicious 0.00000000
• all_one -> control 0.00000000 / malicious 0.00000000
• top_left_only -> control 0.00000000 / malicious 0.00000614
• bottom_right_only -> control 0.00000000 / malicious 0.00000614
• opposite_diagonal -> control 0.00000000 / malicious 0.00000000
• top_row -> control 0.00000000 / malicious 0.00000000
• left_col -> control 0.00000000 / malicious 0.00000000

Reproduce

python reproduce.py