MALICIOUS
94
Risk Score
Malware Insights
MITRE ATT&CK
T1059.001 PowerShell
T1566.002 Spearphishing Attachment
The PDF file was flagged as malicious by an ML classifier and exhibits characteristics of malicious PDFs, including embedded JavaScript and encryption that hides the payload. The presence of JavaScript actions and embedded JS streams indicates that the script is likely responsible for executing the malicious payload. The ML classifier's high score further supports the malicious nature of the file. The specific JavaScript file name is included as an IOC.
Machine Learning
- Nyx PDF Classifier malicious score 0.9997
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.jsc55629c037518de009e9ad72811fbe8d80709b6af0610c00f5e713b4069d5a9a |
pdf-javascript-stream | PDF /JS object 9 at offset 0x3D2 | 26658 bytes |
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