PDF / .TXT malware analysis — malicious · b2915e311e7113af

MALICIOUS

PDF / .TXT

4.0 KB

MD5: d9e2891b9421f3c1ff86e0b83586f9e5 SHA-1: 781084b46e26b736066e4e6f8695355fa4d4af31 SHA-256: b2915e311e7113af891626ba7d85fb779321784d1da1ad1e374dc095f8d555a3

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1027 Obfuscated Files or Information

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The ML classifier strongly flagged this PDF as malicious. The JavaScript stream includes an eval() call and uses String.fromCharCode, suggesting obfuscation. The presence of deobfuscated JavaScript files like 'acroform_b64_00.js' further supports the analysis. The primary function of the script appears to be downloading and executing a secondary payload, though the exact URL or execution method is not directly extractable from the provided evidence.

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` `b2bd5dbfa7446f83bdc01ec82468fdcd6013972b41c5e0444749fda2747caa7b`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6301 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` `4049871683efd01318cb220938065b20418867da1a92142df460c2b3ca422e0b`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3573 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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