PDF malware analysis — malicious · ff1278c37a2e8c84

MALICIOUS

PDF

5.4 KB Created: 2008-07-26 19:43:58 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: fa3cfe9c7d4576f824038caf9d87e954 SHA-1: 3b13bb2f70c7c3dea9f7731915cca1eac9859270 SHA-256: ff1278c37a2e8c84ee5e778514a5c7de77d23b07959442f16c14d857cac2031e

128 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1027 Obfuscated Files or Information

The PDF contains embedded JavaScript with multiple obfuscation techniques, including `eval()` and `unescape()`, which are commonly used to hide malicious code. The ML classifier strongly indicates maliciousness. The presence of a large, obfuscated JavaScript stream suggests the primary purpose is to download and execute a second-stage payload.

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_obj0014_000.js` `73f47353cf06227868ef89b09d1acb1eef7c3f7cfa109efdcf8b40a15521baaf`	pdf-javascript-stream	PDF /JS object 14 at offset 0x38D	76290 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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