PDF malware analysis — malicious · 38c418f7445e26ef

MALICIOUS

PDF

39.9 KB Authoring application: Nambowagay

MD5: ed63cfe2fc2320314a3186eeec778be7 SHA-1: 8e3f0d0ad9ec25de0ed4a33f24260fd623464a32 SHA-256: 38c418f7445e26ef279c08a9374419bf2204fe0db7ca6f32210388802e584ba0

76 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

This PDF file was flagged as malicious by an ML classifier and contains embedded JavaScript. The JavaScript stream uses String.fromCharCode for obfuscation, a common technique to hide malicious code. While the exact payload is not immediately clear due to obfuscation, the presence of JavaScript and the ML classification strongly suggest it's designed to download and execute a second-stage payload. No specific family could be identified.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

Suspicious extracted artifact medium 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.
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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `98ce99304c0c78faa8a6e4b6bd1aa209ecb00c7602abec449e51569a16f8fb11`	pdf-javascript-stream	PDF /JS object 7 at offset 0x40A	39100 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 hex-escaped blob(s).

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