PDF malware analysis — malicious · ea6dfd65f82c5e47

MALICIOUS

PDF

8.9 KB Created: 2009-05-15 08:34:25 Authoring application: vLBXcW (via YxnJ6VBc)

MD5: 04dc4937476502df14a0337cb25ba0cc SHA-1: 33c8ea03537b101fc0871f5d96255eb3d110a8fc SHA-256: ea6dfd65f82c5e4733a5afd15df957586705ad489817fd1856fe28fe2a80afe1

128 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, which is heavily obfuscated using eval() and unescape() calls. This script is highly likely to be responsible for downloading and executing a secondary payload. The ML classifier strongly indicates maliciousness. Due to the obfuscation, the exact nature of the payload and its delivery mechanism cannot be definitively determined.

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)
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_obj0007_000.js` `47a8ace2d7a894dd40e9adb70b27ea58a33660eee0edc410856d5704cc4331e5`	pdf-javascript-stream	PDF /JS object 7 at offset 0x23C	7926 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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