PDF / .TXT malware analysis — malicious · 24c7aba36bb7a12e

MALICIOUS

PDF / .TXT

4.1 KB

MD5: daf0ea9fc523fb8a992de777cb88340d SHA-1: dcc3583c90cb00f96a829e7e9eda733a2e003011 SHA-256: 24c7aba36bb7a12e3db96d5e2a422d97cffbecd3a79ad00a6bfde272566dac4d

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1105 Ingress Tool Transfer

The PDF contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_EVAL'. The ML classifier also flagged this PDF with high confidence. The deobfuscated JavaScript file 'acroform_b64_00.js' likely contains code to download and execute a second-stage payload, a common technique for delivering malware. The presence of 'String.fromCharCode' and 'eval()' calls suggests obfuscation to evade detection.

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` `22da704e74982d319ec3d40b8ab7658fe4cdac8c1367d74c804aa5edd6c96203`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6337 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` `5776c1ac70a366b5aaf2b94344a7ac5d172b1deb5a0f2fc9637e670b33ca0b38`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3598 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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