PDF malware analysis — malicious · 6c57ec147805d9bb

MALICIOUS

PDF

31.3 KB

MD5: 914bd85b00ca6749781f086ecbcea16b SHA-1: 0011d35e40b200d2899571e62b95c5c15125138c SHA-256: 6c57ec147805d9bb0a62c1095f19748b333ff8c3d406e30e7bf3808b4b59119b

146 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript that utilizes an eval() function, a common indicator of exploit activity. The ML classifier strongly suggests maliciousness. The JavaScript stream, though heavily obfuscated and truncated, is the primary mechanism for executing malicious code, likely downloading and executing a secondary payload. The presence of PDF-specific exploit cluster heuristics further supports this conclusion.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0032_000.js` `f209284c09c7fc1029ebc166ebc2480c7a2f6167e9208bdc43a4272e1868036d`	pdf-javascript-stream	PDF /JS object 32 at offset 0x2CA	3048478 bytes

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