Pdf.Dropper.Agent-7212961-0 PDF malware analysis — malicious · 54b7e59fb8615d40

MALICIOUS

PDF

2.6 KB

MD5: 31b3af5aec40881cd5c113703a9f017d SHA-1: c479e63cb8e9eb024d667a4c91829f7ad6daf04e SHA-256: 54b7e59fb8615d40a8e4011e08c542c195042ea9bfd2f694e23a4cf21c5e6e71

156 Risk Score

Malware Insights

Pdf.Dropper.Agent-7212961-0 · confidence 95%

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, including calls to eval() and String.fromCharCode, indicating obfuscated code execution. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload, as indicated by the 'Dropper' classification. The presence of obfuscated JavaScript streams and the high ML score contribute to the confidence in this assessment.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

ClamAV: Pdf.Dropper.Agent-7212961-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7212961-0
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` `bc1f68e9a23fd71635bc6d10e000b4283bfa0f501c79830a681e111a524efec7`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x197	2586 bytes
`javascript_obj111712_001.js` `92c6c22f814d54fe5476f4cd413fc4548844ac2d8a02e8812c0bf938a7bde67d`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x89A	535 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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