PDF malware analysis — malicious · 7ef282bb8608a3fd

MALICIOUS

PDF

1.6 KB

MD5: def5cb0b85ccedee1feaa9310330e54c SHA-1: d3b88053b2ab325ca4d07f356f1113537694e18e SHA-256: 7ef282bb8608a3fd0fa5dce3d75daa6088c5b06d47201d67cba0a6d0bdf6ac60

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1059.003 Command and Scripting Interpreter: Windows Command Shell T1059.007 Command and Scripting Interpreter: JavaScript/TypeScript

The PDF contains obfuscated JavaScript, indicated by multiple heuristic firings including PDF_EVAL and PDF_FROMCHARCODE. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript, named javascript_obj0009_000.js, is likely responsible for executing a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9972

Heuristics 6

ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
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_obj0009_000.js` `750c85f7b1e41a069086eea41bfb8673325936bdb0388ba9885d7bdbbde8074e`	pdf-javascript-stream	PDF /JS object 9 at offset 0xDC	3767 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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