Malware Insights
The PDF file is encrypted and contains embedded JavaScript, which is a common technique to hide malicious content from static analysis. The presence of JavaScript actions and streams, along with the 'PDF_ENCRYPTED_WITH_JS' heuristic, strongly suggests that the script is responsible for delivering the actual malicious payload. The obfuscated document body text does not provide clear user-facing content, further indicating a deceptive purpose. The script's exact function is obscured by its size and potential obfuscation, but it is highly probable that it downloads and executes a second-stage 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.js0cf1443766110d7e5191be1b91296890556aef0145549914b9acd3c5178ef06a |
pdf-javascript-stream | PDF /JS object 9 at offset 0x3D0 | 38622 bytes |
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