PDF malware analysis — malicious · 3b5836a9da515cc5

MALICIOUS

PDF

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

MD5: 3c4d8ef7ca89c82ef28ac8625074f4fe SHA-1: 1151884cd23091dacd0f918d82ba8827b9f2e235 SHA-256: 3b5836a9da515cc5d654e2d7a08e6dd39fc5dd1b613ee05e935f172b42a8903f

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell

The PDF document contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_FROMCHARCODE. The presence of an eval() call within the JavaScript stream is a high-confidence indicator of malicious intent, likely used to deobfuscate and execute further malicious code. The script's purpose is to execute arbitrary code, but the exact payload and delivery mechanism are not fully discernible from the provided information.

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` `e34a06f31efe8dbf430ed073521db95111ca780929b5f8afe02107afb90a8ae8`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	904 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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