PDF malware analysis — malicious · 89eef7d790fbbf47

MALICIOUS

PDF

4.9 KB

MD5: fe7b5a182290fb0c1a38fbdd5f606836 SHA-1: 8842ef57d84ca4e3c25a4fc5025418e2c3fa1c3d SHA-256: 89eef7d790fbbf47ae9a93894a6d0e18ceea2ca728e29d7cdb2f4a060fee866e

188 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF contains obfuscated JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, PDF_EVAL, and PDF_UNESCAPE. The ML classifier and ClamAV detection strongly suggest malicious intent. The extracted JavaScript file, 'javascript_obj0006_000.js', is highly suspicious and likely responsible for downloading and executing a second-stage payload. The ML classifier output of 0.999951 provides high confidence in this assessment.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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)
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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.
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` `91d419762369b41b2c02dc66d16bc1b6d92ad551036bf44943ab9bcd78ec66df`	pdf-javascript-stream	PDF /JS object 6 at offset 0x1A3	4334 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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