PDF malware analysis — malicious · 629e7f825b340ab9

MALICIOUS

PDF

134.5 KB Created: 2009-12-22 12:51:20 Authoring application: ZrCfPFQcujnHgtFJv (via kyKfJokZAVucI)

MD5: c08059d82e95c242d33b24d238b7b3e9 SHA-1: f0e9e444b16c197738f04d8c85ccf81ab2029d9d SHA-256: 629e7f825b340ab950663ba5085412f92e1783b8f022d3e26c333abcd8d5d9c9

116 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is a PDF file that contains embedded JavaScript, flagged by multiple heuristics as a potential exploit. The JavaScript stream, named 'javascript_obj0007_000.js', is likely responsible for executing malicious code. The ML classifier strongly indicates maliciousness, and the presence of JavaScript points towards an attempt to exploit a client vulnerability, likely delivered via spearphishing.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 5

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.
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_obj0007_000.js` `80ef5c099c41d1ebcb07b0c1f1134efb1f7012b7d3cb29da6c867f7809bd73e1`	pdf-javascript-stream	PDF /JS object 7 at offset 0x4C9	135816 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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