PDF malware analysis — malicious · b4dd263f738b1187

MALICIOUS

PDF

11.1 KB Authoring application: Our planet has picked them away from.

MD5: 14d183b3ff8eb59a127199a0718e5670 SHA-1: 0b7b5ca22b841cff2c1eb3900d7b9df3f2c01f59 SHA-256: b4dd263f738b11873b256111daf64d3994445e97a1df24d74f23f278ea7a6de8

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file was flagged as malicious by an ML classifier and contained embedded JavaScript. The JavaScript stream was obfuscated using unescape() and String.fromCharCode, indicating an attempt to hide malicious activity. The primary function of the script appears to be downloading and executing a second-stage payload, as suggested by the heuristic firings and the presence of a JavaScript object. The extracted document body text is largely unreadable and appears to be corrupted or malformed, providing no additional context for the attack's lure.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0018_000.js` `a8950281cb8645f0b6e937bbe6bd2bc90f6cd56540309e1f724c9e681b740785`	pdf-javascript-stream	PDF /JS object 18 at offset 0x4BA	164770 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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