MALICIOUS
64
Risk Score
Malware Insights
MITRE ATT&CK
T1059.001 PowerShell
T1566.001 Spearphishing Attachment
T1027 Obfuscated Files or Information
This PDF file is encrypted and contains embedded JavaScript, a common technique to conceal malicious content. The JavaScript action, triggered by an optional content group, is likely responsible for decrypting and executing the hidden payload. The presence of a large JavaScript stream suggests it's used to download and execute a second-stage payload, making the overall intent a downloader. Confidence is moderate due to the obfuscation preventing a full analysis of the script's exact actions.
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.js3805acc170cdbd3240fa7c24c9aa41f0f30328b7269954000f9a75fda446fcb5 |
pdf-javascript-stream | PDF /JS object 9 at offset 0x3CA | 27854 bytes |
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