PDF malware analysis — malicious · ee44c853707c7774

MALICIOUS

PDF

13.9 KB Authoring application: Honest and if he stared at his superior, or even

MD5: f1885b996091156192fd4dd3af8ad441 SHA-1: 50e93d966a6ee4782f7203a202af28d0cf6f1ad3 SHA-256: ee44c853707c777410e866acc64f41beb63646a746d3ff32d77817345bbfb364

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file was flagged by a machine learning classifier and contains embedded, obfuscated JavaScript. The JavaScript uses `unescape()` and `String.fromCharCode()` functions, indicating an attempt to hide malicious code. 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 an extracted JavaScript file. The obfuscation and download-and-execute behavior are common tactics for malware delivery.

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` `cf0e5137e2c44db6d8407ee824f979c40fd8d54a4c348acb393e4235a8d26642`	pdf-javascript-stream	PDF /JS object 18 at offset 0x4BA	164774 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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