PDF malware analysis — malicious · bb43254e762a6fd0

MALICIOUS

PDF

34.2 KB

MD5: 828060af758d50e141ab2c478e6b5127 SHA-1: 1a0509b5f9c7462d7ddbc25f58c33020401557f3 SHA-256: bb43254e762a6fd0d90c22f63716e0ee7456c8a04b5521f9ad4516bcfb390d93

134 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: Malicious File

The PDF file contains embedded JavaScript, which is flagged as malicious by multiple heuristics and a machine learning classifier. The use of ASCIIHexDecode and ASCII85Decode filters, often employed to obfuscate malicious content, further supports this assessment. The primary attack vector appears to be the execution of malicious JavaScript within the PDF, likely to exploit a vulnerability or download a secondary payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

Correlated malicious PDF JavaScript signals critical PDF_CORRELATED_MALICIOUS_JS

PDF JavaScript or auto-action content is corroborated by exploit staging, ML, or suspicious extracted-artifact findings. This correlation promotes old exploit-kit PDFs that otherwise remain in the suspicious band because each individual signal is intentionally weighted conservatively.
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
ASCII85Decode filter (with exploit indicators) low PDF_FILTER_85

ASCII85 encoding filter present alongside exploit delivery indicators — uncommon outside of obfuscation

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