PDF malware analysis — malicious · 66e4d942ec751d98

MALICIOUS

PDF

3.5 KB Created: 2009-03-18 21:48:22 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: abfe1943d7326414061c7d31c21c551f SHA-1: 49f4c608e94e9c69d84d24c0710681db4d3c2446 SHA-256: 66e4d942ec751d98c4c075d0ecff98b1e40597d9f103dbc9de385e3c6e856659

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF sample contains embedded JavaScript that is heavily obfuscated. The critical heuristic 'PDF_JS_EXPLOIT_CLUSTER' indicates this JavaScript is designed to exploit vulnerabilities within the PDF reader. The deobfuscated script contains calls to 'eval()', suggesting it's intended to download and execute a second-stage payload. The specific payload or its destination could not be determined due to the obfuscation and truncated nature of the script.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

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.
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. (matched inside decoded stream)
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_obj0013_000.js` `69a0f28d08b37bcf1fcd9b12b181ac8b6339ad7964637cb9df299d3dff88db75`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3CE	7162 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`deobfuscated.js` `ddfbab2de10291c7f4fcf7d98222f87d1eaa0f207e434a960d9b03a8b6f6dfbb`	deobfuscated-js	PDF JavaScript deobfuscation pass	15598 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s).

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