PDF malware analysis — malicious · 5c123b43d60f0a86

MALICIOUS

PDF

10.9 KB Created: 2010-02-16 11:19:27

MD5: 06f570d9658be0065ac183a0dfe88dc8 SHA-1: 6a746a2dce4f0ca7768903050ac78b49390c8921 SHA-256: 5c123b43d60f0a8636809494ee7b69aa012a988ce1e44a0a6610dfecf5fa6d03

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript that utilizes an eval() call, a common technique for executing arbitrary code. This JavaScript is likely responsible for exploiting a vulnerability within the PDF reader to achieve code execution. The ML classifier strongly indicates maliciousness, and the presence of JavaScript exploit indicators further supports this. The exact payload or C2 communication is not directly observable from the provided evidence.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0019_000.js` `bb56b0b8244aebaf6724dd53bd228a4f9067774e6a99b0be6685b2da65c6859d`	pdf-javascript-stream	PDF /JS object 19 at offset 0x25D0	223 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`stream_007_off000027e8.js` `2c694c5967b553e90bc2c512dc5fa7be2806bf467167de2c5e259f3464c2ee2d`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x27E8	328 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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