PDF malware analysis — malicious · 089f849dedefae01

MALICIOUS

PDF

81.6 KB Created: 2009-08-22 11:11:20 Authoring application: Scribus 1.3.3.13 (via Scribus PDF Library 1.3.3.13)

MD5: b1568e15a7fb80fc8189a003f8b1c9be SHA-1: 3e1030bddb38bbe22cd493d4b6b120f9f9598935 SHA-256: 089f849dedefae01e823c98970bbec3bf770d35c429e7b7794b2b37a0c3f7de5

148 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF sample contains multiple embedded JavaScript streams, with one stream exhibiting significant obfuscation and containing an eval() call. This JavaScript is likely responsible for downloading and executing a secondary payload, as indicated by the 'PDF_JS_EXPLOIT_CLUSTER' and 'ML_NYX_PDF_MALICIOUS' heuristics. The presence of JavaScript and exploit cluster signals strongly suggests an attempt to exploit a client vulnerability for code execution, likely delivered via spearphishing.

Machine Learning

Nyx PDF Classifier malicious score 0.9836

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_obj0040_000.js` `fef2853bad557fec9e2d7be79a3d673927c55dd5d19165c87ba5cadeab49c210`	pdf-javascript-stream	PDF /JS object 40 at offset 0x114F6	113 bytes
`javascript_obj0041_001.js` `923f33c0e614954eb8372df9e595e7072d1b3bbcf0d40116f5e4a0509ec228b9`	pdf-javascript-stream	PDF /JS object 41 at offset 0x1158F	22705 bytes
`javascript_obj0042_002.js` `a9f44f0b5454444cf3ae3c32bc2aee0949d303f6bd6e78ff01c0ea675cda821a`	pdf-javascript-stream	PDF /JS object 42 at offset 0x13F69	286 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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