PDF malware analysis — malicious · cbfe6b34532bd9d1

MALICIOUS

PDF

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

MD5: ece69f393cec9dd228be7b1b1a12539e SHA-1: d63146a2315a1aa1bf5d6b18639c07255fc52e42 SHA-256: cbfe6b34532bd9d1c716559d523ab79110b52ae73d12cc4569dd36899d71ddd4

98 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_FROMCHARCODE. The presence of a high-severity PDF_EVAL firing suggests the JavaScript is being used to execute arbitrary code. The ML classifier also strongly flags this PDF as malicious. The extracted artifact javascript_obj0001_000.js is likely the source of this malicious JavaScript, which is commonly used to download and execute further stages of malware.

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` `cd1198f3a49a2e4d22e0e8a93022f8c220b3742ef0b5286959c92758d3a77ef1`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	871 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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