PDF malware analysis — malicious · 3f1a776686c7bfc4

MALICIOUS

PDF

4.1 KB

MD5: f2b7dc1842a17afe41d55dfe8c99009a SHA-1: 3723f89bb9f3a35ef3009bae07884bebbffa48ee SHA-256: 3f1a776686c7bfc46e1322532412e8eea4a3a2da40e0910890798f876c92c027

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream includes an eval() call and uses String.fromCharCode, suggesting obfuscation. The ML classifier strongly flags this PDF as malicious. The deobfuscated JavaScript file, acroform_b64_00.js, likely contains code to download and execute a second-stage payload, although the exact URL or execution method is not directly visible in the provided evidence. The presence of these elements points to a malicious document designed for payload delivery.

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` `4cfd00293930c63607df5b2d5116bc5cd421bf8229f5f12064305b3974530763`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6353 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` `452682f3e6151e0ac2cd7c6b765ddf935daa6af01c099c03a1bd8472072b8e62`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3611 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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