MALICIOUS
94
Risk Score
Malware Insights
MITRE ATT&CK
T1059.001 PowerShell
T1566.002 Spearphishing Attachment
The PDF was flagged as malicious by an ML classifier and contains embedded JavaScript, which is used to conceal the actual payload. The presence of JavaScript within an encrypted PDF structure indicates an attempt to evade static analysis and deliver a malicious payload. The specific JavaScript content was not fully analyzed due to its size and potential obfuscation, but its presence is a strong indicator of malicious intent.
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.js3a42ac85a4d58ce3f539de175505c7fb7b30063c4ff762ccb24d72b52cb54d3f |
pdf-javascript-stream | PDF /JS object 9 at offset 0x3C1 | 35980 bytes |
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