MALICIOUS
94
Risk Score
Malware Insights
MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment
The PDF file was flagged as malicious by an ML classifier and exhibits multiple high-severity heuristic firings related to JavaScript execution and encryption. The presence of embedded JavaScript, specifically noted as 'Encrypted PDF carries /JavaScript', indicates that the malicious content is intentionally obfuscated. The JavaScript object 'javascript_obj0009_000.js' is the likely carrier of the payload, designed to evade static analysis and deliver a malicious payload to the user.
Machine Learning
- Nyx PDF Classifier malicious score 0.9996
Heuristics 4
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Encrypted PDF carries /JavaScript — payload hidden from static analysis high PDF_ENCRYPTED_WITH_JSPDF declares /Encrypt and also references an executable trigger (/JavaScript). Document encryption hides the JavaScript body and stream contents from static scanners — combined with auto-execution indicators this is a known evasion pattern used to deliver weaponised JavaScript that the analyst cannot inspect without the decryption key.
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JavaScript action low PDF_JAVASCRIPTPDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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Embedded JS stream low PDF_JSPDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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Optional Content Group with action trigger low PDF_OPTIONAL_CONTENTOptional Content Group (layer) co-occurs with an action trigger — content can be selectively hidden from viewers or scanners while the action still fires on open
Extracted artifacts 1
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
javascript_obj0009_000.js1ad7fe96a01f86bd6be78245ca39abf2dfbae3f9c249f78280d950c61e926d51 |
pdf-javascript-stream | PDF /JS object 9 at offset 0x3D4 | 35912 bytes |
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