PDF malware analysis — malicious · 6b3999dc54538b2f

MALICIOUS

PDF

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

MD5: 429d544466fa5983eff4ecbfa9ffd8ed SHA-1: 147612e1e4ba50cf24d59eeb98cf66cbb09db3eb SHA-256: 6b3999dc54538b2fa4f49cb7bccee3318c0c04c1fff39610459ebe2405fe7994

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains embedded JavaScript that utilizes an eval() call, a common technique for executing obfuscated code. The script appears to be designed to exploit a PDF vulnerability, likely to download and execute a second-stage payload. The presence of multiple JavaScript streams and the 'PDF_JS_EXPLOIT_CLUSTER' heuristic strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 5

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.
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` `49d1768bc049dbf6d77730deed2bbec26e7a4be50bc0c4375417669582e44312`	pdf-javascript-stream	PDF /JS object 32 at offset 0x3A8	1468581 bytes
`javascript_obj0034_001.js` `d797de515dac4f8369b71edf86d0fc9aa8fe1224d8f9d3f1eea8a19a1f23bfc7`	pdf-javascript-stream	PDF /JS object 34 at offset 0x3CE3	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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