PDF malware analysis — malicious · c307a7cdfb8b9ac4

MALICIOUS

PDF

17.9 KB Created: 2010-03-07 13:18:25 Authoring application: zESyjc8klhI9F3 (via kxtK44xNW5Y4)

MD5: f38a8b7989a1d8e8a375a594cc41a6c1 SHA-1: ba62535b4c959b2b8204b5f1d55d50090a0ade86 SHA-256: c307a7cdfb8b9ac4095d27137012c2f25337627700f3bbd0ccccf7733eab4c90

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF sample contains embedded JavaScript, indicated by PDF_JAVASCRIPT and PDF_JS heuristics. The presence of a high-confidence PDF_EVAL rule firing suggests the JavaScript is obfuscated and likely malicious, attempting to execute arbitrary code. The ML classifier also strongly flags this PDF as malicious. The embedded JavaScript file, javascript_obj0007_000.js, is the primary artifact. The script's intent is inferred to be the download and execution of a secondary payload, a common technique for initial access.

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_obj0007_000.js` `c87a285da452b1cbd446c769a216c9174009fce636918bc0cc0aa536f9a601f8`	pdf-javascript-stream	PDF /JS object 7 at offset 0x23C	17068 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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