PDF malware analysis — malicious · 000df6fb6f1a75ad

MALICIOUS

PDF

2.6 KB

MD5: bc057c9fa839901548e10007e34b123f SHA-1: af12973d2bbe9c5fe750f2b44c3a09a470d5f22a SHA-256: 000df6fb6f1a75ad09f6a90fac84970df7ffba653d17b30895357a1750804d24

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript that utilizes eval() and String.fromCharCode() functions, indicating obfuscation and potential exploit execution. The JavaScript streams, particularly 'javascript_obj111612_001.js', appear to be heavily obfuscated but contain patterns suggestive of downloading and executing further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it's designed to deliver a secondary payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
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_obj111611_000.js` `8221735c1829d038c7ff7e765fd95fc8b481305156d8288e3b3f9cae3d2a1b27`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x197	258 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj111612_001.js` `34a84b0ce84bf0ad36abaca4fb4b8105385a9f6b1292203f2432a160609caa5c`	pdf-javascript-stream	PDF /JS object 111612 at offset 0x268	3333 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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