MALICIOUS
64
Risk Score
Malware Insights
MITRE ATT&CK
T1059.001 PowerShell
T1566.001 Spearphishing Attachment
The PDF file is encrypted and contains embedded JavaScript, which is a common technique for obfuscating malicious content. The presence of JavaScript actions and an embedded JS stream, combined with the PDF encryption, strongly suggests that the JavaScript is used to deliver a hidden payload. The document body is heavily corrupted, preventing analysis of its content. The JavaScript object is the primary IOC. Confidence is reduced due to the inability to analyze the document body or the specific JavaScript payload.
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.js0071d7739060bf42aa25e82472763953e726fe0ae3a4567b8fad6d411a763248 |
pdf-javascript-stream | PDF /JS object 9 at offset 0x3DE | 25018 bytes |
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