PDF / .TXT malware analysis — malicious · dbb147378e561472

MALICIOUS

PDF / .TXT

4.0 KB

MD5: efc4b12e05689d57f4e9a5edc0d99055 SHA-1: 0ca58788d5be9d3dd67ef571b8673f7e4f95cc2e SHA-256: dbb147378e561472edf8ef131fd5f30de352afd5ea131460f73029c54a7dc096

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The presence of eval() and String.fromCharCode within the decoded JavaScript stream suggests code execution and obfuscation. The ML classifier strongly flags this PDF as malicious. The deobfuscated JavaScript file 'acroform_b64_00.js' likely contains the core malicious logic, possibly downloading and executing a secondary payload, which is a common technique for initial access.

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` `1022e59b4244fb4273f9184557c116b74a6c1172964a7c627eb4672c60ab085e`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6221 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` `06a78f6002f83a7cecbc34f08a600cfc4f1e3c7022946b8113c9d6d9fa27ffcd`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3511 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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