MALICIOUS
66
Risk Score
Malware Insights
MITRE ATT&CK
T1059.001 PowerShell
T1059.007 JavaScript
The PDF file contains embedded JavaScript, which is heavily obfuscated using eval() and String.fromCharCode. The heuristics indicate that this script is designed to download and execute a second-stage payload. The presence of multiple JavaScript-related heuristics and the extracted JavaScript files strongly suggest malicious intent, likely for malware delivery.
Heuristics 5
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eval() call high PDF_EVALeval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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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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String.fromCharCode low PDF_FROMCHARCODEString.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
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Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGEOne or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
Extracted artifacts 2
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
javascript_obj0013_001.js54c0b190c93d2c25ace2715ed07e80d90c294013a52d80245d03daba785cbcdd |
pdf-javascript-stream | PDF /JS object 13 at offset 0x368 | 6325 bytes |
|
Detection
ClamAV:
No threats found
Obfuscation or payload:
likely
Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
|
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acroform_b64_00.jsf58c32cec8fbd42c951ca7ce6dbc0c3061a1c22e45c77a0611bf89930b4eb009 |
deobfuscated-js | PDF AcroForm base64 (decompressed) at offset 0x99D | 3589 bytes |
|
Detection
ClamAV:
No threats found
Obfuscation or payload:
likely
Carved artifact contains 2 eval/decoder/string-building token(s).
|
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