PDF malware analysis — malicious · ccf195907c18ed77

MALICIOUS

PDF

33.2 KB Created: 2009-08-02 04:28:55 Authoring application: NTmqOeIskQQrAlFWEcS (via TfcTLngjzoGNrTCWyDSHxR)

MD5: a3eac797db7fafedfc67e72414ab320b SHA-1: 8c057f5087e959e0094b687c4aa3f2342a69f3f3 SHA-256: ccf195907c18ed7796534c8469adeb15889e0a9547085974c7de92c235c43b5c

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file was flagged by a machine learning classifier as malicious and contains embedded JavaScript. The JavaScript stream is heavily obfuscated using String.fromCharCode and eval() calls, indicating an attempt to hide malicious functionality. The primary intent appears to be downloading and executing a second-stage payload from a remote source, as suggested by the obfuscated script and the 'ML_NYX_PDF_MALICIOUS' heuristic.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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_obj0021_000.js` `053638148fbc26982bb27736510729a9b24f9b168139b7ae1b0bf70b453ea328`	pdf-javascript-stream	PDF /JS object 21 at offset 0x4189	16101 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 12 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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