PDF malware analysis — malicious · c2545434e5a4f980

MALICIOUS

PDF

28.2 KB Created: 2010-03-15 12:18:26 Authoring application: r7sLo (via TkAYHozaq2thf)

MD5: f1652b0feb472c2f3681404f31c6b53a SHA-1: 9020d6d3a27816ce9fe57b3e9425279f5d9ff9f3 SHA-256: c2545434e5a4f9806dc348b0d2ed18499af62b6f4d2704e65b058f37a4b39cfd

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1204.002 Malicious File: Malicious JavaScript

The PDF contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT and PDF_JS. The high-severity PDF_EVAL heuristic indicates the use of eval(), a common technique for obfuscating malicious JavaScript. The ML classifier also strongly indicates maliciousness. The embedded JavaScript file, javascript_obj0007_000.js, is likely responsible for downloading and executing a secondary payload, though its exact function is obscured by obfuscation. The confidence is reduced due to the inability to fully deobfuscate and analyze the script's precise actions.

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.
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `d793bb982b02f3eaaed86bd84086eba6dcaf7cdb8a6d9de77a3c8f4582e9f5b4`	pdf-javascript-stream	PDF /JS object 7 at offset 0x238	27631 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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