MALICIOUS
64
Risk Score
Malware Insights
MITRE ATT&CK
T1059.001 PowerShell
T1566.001 Spearphishing Attachment
T1027 Obfuscated Files or Information
The PDF file contains embedded JavaScript, which is further obfuscated and used to encrypt the document's content. This technique is commonly employed to hide malicious payloads from static analysis. The presence of PDF_ENCRYPTED_WITH_JS and PDF_JAVASCRIPT heuristics indicates an attempt to conceal malicious activity. The embedded JavaScript file itself is the primary IOC, suggesting it's responsible for the malicious functionality.
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.js277b9c95f60843e117b8edb14c1e658ea9f8520362b845d902a57024dddbcfbf |
pdf-javascript-stream | PDF /JS object 9 at offset 0x3C5 | 32848 bytes |
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