PDF malware analysis — malicious · 0c039176f619e534

MALICIOUS

PDF

8.0 KB Created: 2011-72-51 03:25:00 Authoring application: String.fromCharCode

MD5: 0c57bcbf7ca7acb470eae182cb200f98 SHA-1: b9898b36997889393c80467e6be2a549eba9e458 SHA-256: 0c039176f619e53404fe07a3cb051b2b1d2633a4bce5fb3e0d3fc70f7c945413

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1059 Command and Scripting Interpreter T1203 Exploitation for Client Execution

The PDF file contains obfuscated JavaScript that utilizes eval() calls to construct and execute code. This script appears to be designed to download and execute a second-stage payload, as indicated by the 'PDF_JS_EXPLOIT_CLUSTER' heuristic and the ML classifier's high confidence score. The specific payload URL or execution details are heavily obfuscated, preventing confident identification of the final action.

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.
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_obj0001_000.js` `f341084b7e0c97602d095a1ea3b4fa17fe931d5ebe8d3f1bf201566f7a1bdd83`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	934 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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