PDF malware analysis — malicious · 138acde9f56d9ada

MALICIOUS

PDF

11.7 KB Created: 2009-07-13 19:22:54 Authoring application: sOY (via jsi)

MD5: 34c380d78496c6f9e21593d8548e6bfc SHA-1: 60e94e313351969eaf4b2e85cd4545fed77703bb SHA-256: 138acde9f56d9ada179593c010c7856e781a255ca781f17f9715edf28d507f66

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file contains obfuscated JavaScript, indicated by multiple PDF_JAVASCRIPT and PDF_JS heuristics, and a critical PDF_JS_EXPLOIT_CLUSTER finding. The JavaScript code uses eval() to execute further obfuscated code, which is designed to download and execute a second-stage payload. The ML classifier strongly indicates maliciousness. The specific exploit and payload are not detailed, leading to an unknown family classification.

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.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
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.
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_obj0006_000.js` `b15ed3927f6b1cc9e3fce7f33304beba797c0458865b08251aae2516cc13dfd2`	pdf-javascript-stream	PDF /JS object 6 at offset 0x177	219 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

Open this report in the interactive analyzer, or submit your own file for analysis.