PDF malware analysis — malicious · a411cc1c2f467c23

MALICIOUS

PDF

5.9 KB Created: 2008-12-03 13:57:41 UTC

MD5: c16301792c844208225df0e92cc905c3 SHA-1: 79a3e77d2f2290801abe5de96bf7c82dd7224e1e SHA-256: a411cc1c2f467c23e8fe3092021ad023a89a6522ccd87638b7944a1a89cda17a

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file was flagged as malicious by an ML classifier and contained embedded JavaScript. Heuristics indicate the use of eval() and String.fromCharCode, suggesting code obfuscation and dynamic execution. The embedded JavaScript file, javascript_obj0006_000.js, is the primary IOC. The obfuscated nature of the script and the use of eval() strongly suggest it's designed to download and execute a second-stage payload.

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. (matched inside decoded stream)
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` `08cfa44ddb3e87a7494d9b0ef9439ee4597a1bf0c6c0cc80ddb3b41080287926`	pdf-javascript-stream	PDF /JS object 6 at offset 0xC5	9491 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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