PDF malware analysis — malicious · aeef617d3f393e3f

MALICIOUS

PDF

8.0 KB Created: 2011-72-51 03:25:00 Authoring application: String.fromCharCode

MD5: e55bc51f50d6fed837e6c65b7a98160a SHA-1: d1eb75696e93e664cb811e1989adb389aa501145 SHA-256: aeef617d3f393e3fde5bff7d773a183446292008f07ba7271ede13c9fd28698d

98 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of PDF_FROMCHARCODE and a high-confidence PDF_EVAL heuristic suggests the JavaScript is obfuscated and designed to execute arbitrary code. The ML classifier also strongly flags this PDF as malicious. The extracted JavaScript file, javascript_obj0001_000.js, is likely responsible for downloading and executing 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.
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_obj0001_000.js` `ed7f6587d1910fb4115b96cc13a2091dad77de062941a4140bcd3535c6bcf552`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	971 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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