PDF malware analysis — malicious · 0fee4ed699ca2161

MALICIOUS

PDF

12.2 KB Created: 2011-02-07 21:06:29 +03:00 Authoring application: jFZXI_t (via 4b025)

MD5: edbcb4925dd06fa02ebe0802860227f6 SHA-1: 6f18bb736a1eda56de6f936ae87aa199ad3ac96c SHA-256: 0fee4ed699ca21614781d3d101db831b5779915cfa562eb9c11409965869e7a3

164 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple embedded JavaScript streams, with heuristics indicating the use of eval() and String.fromCharCode, suggesting obfuscated code execution. One script calls app.doc.eval() with reconstructed strings, indicating it's designed to execute further malicious code. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it's a dropper or exploit loader.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

Heuristics 7

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)
Optional Content Group with action trigger low PDF_OPTIONAL_CONTENT

Optional Content Group (layer) co-occurs with an action trigger — content can be selectively hidden from viewers or scanners while the action still fires on open
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_obj0011_000.js` `09979ee0f6ade7fd65d25f1da5ef8877ccb200ee88f8d4ba15e55f176baeb6de`	pdf-javascript-stream	PDF /JS object 11 at offset 0x249F	2369 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0013_001.js` `880f14df0987fb341cf0fe43e24d76ddcd893ef62cd002b27deb79eaa00de387`	pdf-javascript-stream	PDF /JS object 13 at offset 0x28D7	1140 bytes
`javascript_obj0015_002.js` `986b4c10ef211ece4a888dc9f03b28c9e178bc19953b59b748123ce86b66a59b`	pdf-javascript-stream	PDF /JS object 15 at offset 0x2B57	296 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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