PDF malware analysis — malicious · 76596f18c6a5e012

MALICIOUS

PDF

75.5 KB Created: 2010-03-16 12:18:44 Authoring application: tgDO5 (via p7ori)

MD5: 0e0629e0659be65228d5f6d631de0ea7 SHA-1: f1ba8df297b088f8279b31d54018609e7796666c SHA-256: 76596f18c6a5e012ea14e0111c7302bb61d98d9faf350f1cd98b8232ab310ac6

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains embedded JavaScript that is heavily obfuscated and utilizes `eval()` and `String.fromCharCode()`. This JavaScript is flagged as an exploit cluster, indicating it is designed to execute malicious code. The primary function of this script appears to be downloading and executing a second-stage payload, as suggested by the exploit cluster heuristic and the presence of obfuscated code typical of droppers. No specific family could be identified due to the obfuscation.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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.
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` `235c33e74db73bde10992313dd2445c8f2ec2107f68b9704caf93242974f4d29`	pdf-javascript-stream	PDF /JS object 7 at offset 0x246	76049 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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