PDF malware analysis — malicious · 29872b699a5628b1

MALICIOUS

PDF

2.5 KB

MD5: cdef1b696f5b122daceb6add996740ec SHA-1: f66f4cc502edbc9b66f398a96e1fa721e2ab5080 SHA-256: 29872b699a5628b17d85502141647eab335748ef2950f07d1987e833db0a843a

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, which is flagged by multiple heuristics including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The ML classifier also strongly indicates maliciousness. The embedded JavaScript streams, named javascript_obj111711_000.js and javascript_obj111712_001.js, are the primary mechanism for executing malicious code. The use of eval() and String.fromCharCode suggests obfuscation, typical of downloaders that fetch and execute second-stage payloads.

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_obj111711_000.js` `f56d992dcb6b00b9879fb8a6d126578c8559f1f1c0c6d1c9994ffa65554a262a`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x197	2538 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`javascript_obj111712_001.js` `533f650951d64b43969dea6b4e2e28bf97a83f41fcef8c723539d4ef9b7267e1`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x826	545 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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