PDF malware analysis — malicious · cb8dc3715b989a5e

MALICIOUS

PDF

4.4 KB Created: 2008-12-17 23:30:58 UTC

MD5: e62f02e1a84145e6488aa9d5bc57c02a SHA-1: 362caa4b1485749f462f7a86fbb1f4bb7fed0336 SHA-256: cb8dc3715b989a5ec561f6985c74e92e2eea05392cbdf0e1395b038cd5f7066c

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of PDF_EVAL and PDF_FROMCHARCODE suggests the JavaScript is obfuscated and uses eval() and String.fromCharCode to execute malicious code. The ML classifier strongly flags this PDF as malicious. The embedded JavaScript file, javascript_obj0006_000.js, is the primary artifact, likely responsible for downloading and executing a secondary payload.

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. (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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `866a1a9600731cd95e0fd38ba9c35a9d6759fbc1871c5d15fd5253779f32045a`	pdf-javascript-stream	PDF /JS object 6 at offset 0xB5	30679 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s).

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