PDF / .TXT malware analysis — malicious · 9fa6da1d37a2a0c7

MALICIOUS

PDF / .TXT

4.1 KB

MD5: d809b18f2f5821e020f6b9e7529f93f0 SHA-1: 6fb82dbd19f5be2fcd0258562ddc6f997052099b SHA-256: 9fa6da1d37a2a0c7010345e791af979e9b67c885bb56b327a5474753b0aa3d23

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1027 Obfuscated Files or Information

The PDF contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The PDF_EVAL and PDF_FROMCHARCODE firings, along with the ML classifier's high confidence, suggest that the JavaScript is obfuscated and likely performs malicious actions such as downloading and executing a second-stage payload. The presence of two JavaScript files, 'javascript_obj0013_001.js' and 'acroform_b64_00.js', further supports this. The exact payload or C2 infrastructure is not directly discernible 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` `b3b31e98332da16c82b2eb4f90d176751982df8a7c311787384ba05a7b1eac03`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6385 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` `492c4cdfb3e83c87875b590d8f3caa52fcef2e7d41615ab1e99b880c84aa1a38`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3636 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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