PDF malware analysis — malicious · c6e7c83cdd91c483

MALICIOUS

PDF

4.1 KB

MD5: e01c165d3472d96eeab99830f15be648 SHA-1: 5ee28ab4b654ba6a0dc44723203f3b7c8bad52ac SHA-256: c6e7c83cdd91c483ed03982f5d3b24df4e8c55c9ab8564d813a6fda2c2bdb4f8

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1204.002 Malicious File: Exploitation by User Interaction

This PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The ML classifier strongly flagged this PDF as malicious. The embedded JavaScript, specifically within the 'acroform_b64_00.js' artifact, likely uses eval() and String.fromCharCode() to deobfuscate and execute malicious code. This code is suspected to download and execute a second-stage payload, a common technique for initial access.

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` `f761455c6ad33229c4a042cf4d72a21de3da9731ef16e32a3301bac633d3b100`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6433 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` `17fc2dd920f8c3f0e93c40cb673ddbb25fe7ade8f27bd25309e51544f0e967af`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3670 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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