PDF malware analysis — malicious · ecfba13163ba1511

MALICIOUS

PDF

70.2 KB Created: 2010-03-07 03:18:45 Authoring application: sivX9ODyKi (via oGgUYbo)

MD5: dc7f968848906ddd1775818f0eb7623b SHA-1: 75b7d6d688e0d09aed2a2945019038564d20eebd SHA-256: ecfba13163ba1511423742b41cd601fcde2629336db2c6db4253b1fa0828476f

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

This PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream includes an eval() call, a high-severity indicator, suggesting obfuscated code execution. The ML classifier also flagged this PDF as malicious with high confidence. The primary attack pattern involves leveraging JavaScript to execute arbitrary code, likely to download and run a second-stage payload. The presence of the javascript_obj0007_000.js file further supports the analysis of embedded script content.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 5

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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape 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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `97a63f3773f7089cba89e9b4aaf160e1183d555890389192cd82fc21eb5ac66a`	pdf-javascript-stream	PDF /JS object 7 at offset 0x234	70682 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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