PDF malware analysis — malicious · c44688821a63b742

MALICIOUS

PDF

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

MD5: 7384c5ff4d46ac544db04d6a527f1a22 SHA-1: bb859cbc2d31fc7211d08f81aec0a4f6a63df202 SHA-256: c44688821a63b742b131d5962dae0b714b247ca7e9ef5f969799abb6187e1571

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell

This PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The JavaScript stream, identified as javascript_obj0001_000.js, likely contains obfuscated code that uses eval() to execute arbitrary commands. The presence of String.fromCharCode further suggests code obfuscation. The primary function appears to be downloading and executing a second-stage payload, though the exact URL or payload is not directly extractable from the provided evidence.

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` `59babb17f1b7909dcf3cce3fb15e8b9af7e765e8fa478601f20b1b125e29f514`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	519 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).

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