MALICIOUS
94
Risk Score
Malware Insights
MITRE ATT&CK
T1059.001 PowerShell
T1566.001 Spearphishing Attachment
T1027 Obfuscated Files or Information
The PDF file was flagged as malicious by an ML classifier and exhibits high-risk heuristics indicating it is encrypted with JavaScript. This suggests the JavaScript is used to conceal the actual malicious payload, which is likely downloaded and executed. No document body text was available for analysis, and the embedded JavaScript stream was truncated, limiting further analysis of the specific payload or delivery mechanism.
Machine Learning
- Nyx PDF Classifier malicious score 0.5474
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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Embedded file low PDF_EMBEDDEDPDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
Extracted artifacts 1
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
javascript_obj0040_000.jsb3400b0ccfaeba76c8038e5f31fa8b4d92630127999bd600e34ff3ffe9e1d0da |
pdf-javascript-stream | PDF /JS object 40 at offset 0x147C1 | 608 bytes |
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