PDF malware analysis — malicious · 7c80cf76d321d29b

MALICIOUS

PDF

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

MD5: cd8991dfa702536d8cda2c19bf465613 SHA-1: ca803c28fa8164f2b5e287aabc6c94a889b8f508 SHA-256: 7c80cf76d321d29beb3e56eaaf88af40ef4d898d76e6c24be413367740733161

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1059.003 Command and Scripting Interpreter: Windows Command Shell T1204.002 Malicious File: User Execution: Malicious JavaScript

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of a PDF_EVAL firing and the ML classifier's high confidence score suggest that the JavaScript is designed to execute arbitrary code. The extracted artifact 'javascript_obj0001_000.js' is likely the source of this malicious script. The script's purpose is inferred to be downloading and executing a second-stage payload, a common technique for malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

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` `f1fbe8a0fbfc471a6d7b74fd797f21e69efc14fa2ea3f4e51f8f64754648d589`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	1001 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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