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DL4J preprocessor.bin deserialization marker

This repository contains a benign local verification artifact for a suspected DL4J model-archive issue. It does not contain exploit code or a gadget chain.

ModelSerializer.restoreMultiLayerNetwork(...) and restoreComputationGraph(...) read a model ZIP entry named preprocessor.bin with a raw ObjectInputStream, then cast the result to DataSetPreProcessor. The cast happens after Java deserialization has already reconstructed the object.

Run locally:

javac VerifyDL4JPreprocessorBin.java
java VerifyDL4JPreprocessorBin

Expected benign output:

deserialized_class=java.lang.String
cast_after_deserialization=ClassCastException

The generated payload-preprocessor-string.zip is intentionally harmless. It contains a serialized java.lang.String marker in preprocessor.bin, which is enough to show that bytes supplied by the archive are deserialized before any allowlist, object filter, or successful type validation.

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