PDF malware analysis — malicious · f6d93fa70310ad56

MALICIOUS

PDF

9.3 KB Created: 2011-72-51 03:25:00 Authoring application: String.fromCharCode

MD5: b6619221782878bedf63f5f94a8f0725 SHA-1: 611195fd3ddb6452e6976419273371c2ede01811 SHA-256: f6d93fa70310ad56cda2ad0a2862189026e28060ac17a359c9207243991fa59a

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file was flagged as malicious by an ML classifier with high confidence. Static analysis revealed embedded JavaScript, including the use of `String.fromCharCode` and an `eval()` call, indicating obfuscated code execution. The embedded JavaScript file `javascript_obj0001_000.js` is the primary artifact. The `eval()` call strongly suggests the script is designed to download and execute a second-stage payload.

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.
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0001_000.js` `f98f5419850c22b33682c8c4c28e1e4254593e086f49cd5c6f0b7ae98fed132e`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	992 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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