PDF malware analysis — malicious · 0a98a8b6ed8e735b

MALICIOUS

PDF

16.2 KB Created: 2007-12-35 21:45:26 Authoring application: Adobe

MD5: 2f1e552d8a0aa555ca716b3e212787df SHA-1: 677ad36290ca9dd7fa44885e7ec32779e9f2f64a SHA-256: 0a98a8b6ed8e735b6458ffedbdd99e9647c6da82c13040e71d5768bca29a1b00

208 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains multiple JavaScript streams, with one being particularly large and heavily obfuscated. Heuristics indicate the use of eval() and a JavaScript exploit cluster, strongly suggesting the script is designed to execute malicious code. The ClamAV detection of 'Pdf.Exploit.Agent-19044' further supports this, pointing to a known PDF exploit. The script's obfuscation and the presence of exploit-related heuristics indicate it likely downloads and executes a secondary payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 6

PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
ClamAV: Pdf.Exploit.Agent-19044 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-19044
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.
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0032_000.js` `cf1bf63c14b2118635bba2c8b4c8a5331b3807fe9c37541b294970884b3c918e`	pdf-javascript-stream	PDF /JS object 32 at offset 0x3A8	1497813 bytes
`javascript_obj0034_001.js` `d797de515dac4f8369b71edf86d0fc9aa8fe1224d8f9d3f1eea8a19a1f23bfc7`	pdf-javascript-stream	PDF /JS object 34 at offset 0x3DFE	332 bytes
`javascript_obj0036_002.js` `351349db1f2c462951d107c63f395d2e3d546cbac252089bc55d7cd7501a396b`	pdf-javascript-stream	PDF /JS object 36 at offset 0x80	426 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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