PDF malware analysis — malicious · 14596da15e57910b

MALICIOUS

PDF

20.8 KB Created: 2009-07-13 19:22:54 Authoring application: unesOY (via evaljsi)

MD5: 8cdcfac89cf30deb93c4c5f78fccd7a4 SHA-1: c5502d3d0744020943121d5cc94f35c6f67513b6 SHA-256: 14596da15e57910bbd296f36bdb1f0dced15ca255e1af6f6ef8071a41c916a77

116 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript that is heavily obfuscated using String.fromCharCode and concatenation. The script appears to be designed to evaluate further obfuscated code, which is a common technique for downloading and executing additional malicious content. The ML classifier strongly indicates maliciousness, and the presence of exploit-related heuristics further supports this. The exact payload and destination are not discernible due to the obfuscation.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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.
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `4984f22ec14e5815e7c0e4c1446bfdaec01b01ff40f296453f8bc45102c03418`	pdf-javascript-stream	PDF /JS object 6 at offset 0x177	201 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj0006_001.js` `0549512015e9ce7551ecc237bf2c19e35ea0769ef55cf45d29f3f57e7c3dc207`	pdf-javascript-stream	PDF /JS object 6 at offset 0x19A	20918 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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