PDF malware analysis — malicious · 612ba39070e0bfa6

MALICIOUS

PDF

3.8 KB

MD5: 0f4653b385c723c2403027502ef332da SHA-1: be38bf00e10a0b7e7fcca9bb9886543a253f03e9 SHA-256: 612ba39070e0bfa6e60873112281175cfd592ed97fee0f79b2e91a09a1d84d34

116 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF contains obfuscated JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics, and the ML classifier's high confidence. The script is designed to download and execute a second-stage payload, as evidenced by the PDF_JS_EXPLOIT_CLUSTER firing. The obfuscated JavaScript is the primary indicator of malicious intent, suggesting this PDF is likely delivered as a malicious attachment.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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. (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_obj0032_000.js` `c88cf77efaff6bc3b76299ba4083fd6dadfc93dfa8e53ea68430288b56c32f69`	pdf-javascript-stream	PDF /JS object 32 at offset 0xC5	15592 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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