PDF malware analysis — malicious · e9f5cbe25d81d453

MALICIOUS

PDF

4.0 KB

MD5: e415a3faee01a111ed210021e4da8480 SHA-1: f76fa0f31ec27c91a9d2a21fae43b626ae7db58c SHA-256: e9f5cbe25d81d453c18688531fcac8829b831c0210e1f43488df8b853fb40640

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

This PDF file was flagged as malicious by a machine learning classifier with high confidence. Static analysis revealed embedded JavaScript streams, including one that uses eval() and String.fromCharCode, indicating obfuscated code execution. The presence of these JavaScript artifacts suggests the PDF is designed to download and execute a secondary payload. The specific obfuscation techniques and lack of clear indicators prevent definitive family attribution.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_001.js` `2c642c7eae0771bbee1d119d46ae0441e7f6004425eb83c6f20daf478035917d`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6253 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`acroform_b64_00.js` `a42a54ef7f0af94dfab8323a0166b5dcd0750bac04bfa4ae099fe39cfad605b8`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3536 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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