PDF malware analysis — malicious · fe404dd2b0f1c4c9

MALICIOUS

PDF

2.6 KB Created: 2008-31-20 53:85:00 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: e7ff4b52c58051486a87e8cee2892c6f SHA-1: 37eb4be4681018aa893c045e68f9f5ea53f49ce6 SHA-256: fe404dd2b0f1c4c9d63bdb8a59f302259532232cabbda8e1c8b30d3f443ac290

90 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The ML classifier strongly suggests maliciousness. The unescape() function is used, which is often employed to deobfuscate malicious JavaScript. The extracted artifact javascript_obj0013_001.js is likely the deobfuscated script, which is expected to download and execute a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

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_obj0013_001.js` `9d48d28e150191cc2ae2f6829d66589821587f38eb7468791c4b0fbd2db2fa99`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3D7	3278 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 16 eval/decoder/string-building token(s).

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