PDF malware analysis — malicious · 57377e58ba7d0995

MALICIOUS

PDF

5.1 KB Created: 2008-08-06 01:42:27 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: a45dde21f43d340e701ec772ee2ca03b SHA-1: be781a01871852694eaa2313d5ef6675e2a09add SHA-256: 57377e58ba7d0995def51ee194a1dfd9c4d56c07116bddb7b9465d1a1150567f

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF contains embedded JavaScript, with heuristics indicating the use of eval() and String.fromCharCode, suggesting obfuscated code execution. The ML classifier strongly flags this as malicious. The presence of deobfuscated JavaScript files (acroform_b64_00.js and javascript_obj0013_001.js) indicates the script's likely intent is to download and execute a second-stage payload. The exact payload or download URL could not be determined due to obfuscation.

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)
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_001.js` `3a9a90b33ceacce7aba7403da09f11288b091408a5e88ac7ac9f59f5503f636b`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6736 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`acroform_b64_00.js` `6268c1ef03eb8eb5b4d9425d47c72a03595e643651956e36a684a2c849ee571d`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x723	4374 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 7 long base64-like blob(s).

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