PDF malware analysis — malicious · dfd8fc9f0b6dbcab

MALICIOUS

PDF

3.9 KB

MD5: 8cebd1c0f8a2c162e20baec6132c0de9 SHA-1: 09f4a9ad5c9420a9d864d937f59f42e6a2ef2aef SHA-256: dfd8fc9f0b6dbcab9ed2d0e35040a9a7e4794f977054cfdf4ca842b107c53f30

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1204.002 Malicious File: User Execution: Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The PDF_EVAL heuristic specifically points to an eval() call within a decoded stream, suggesting code execution. The presence of two embedded JavaScript files, 'javascript_obj111711_000.js' and 'javascript_obj111712_001.js', further supports this. The script likely downloads and executes a second-stage payload, a common technique for initial access.

Heuristics 5

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
String.fromCharCode low PDF_FROMCHARCODE

String.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)
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One 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_obj111711_000.js` `b503448ac3d72eebada75ef8362d6fe7b5e75a6a51deae86ec39f4008e48472c`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x197	371 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj111712_001.js` `55ce41cdb64d6f8c3480bfe6eef4e4f8ce8663531b5a7e4b611197b9c142f852`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x247	5236 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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