PDF malware analysis — malicious · 1b84de272461cf68

MALICIOUS

PDF

3.4 KB Created: 2009-01-05 15:08:10 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: 93145250325e61fbb6a3ee4891a2b08d SHA-1: a3e07f7f188e610ad2e545f3d293a2e0a428f09e SHA-256: 1b84de272461cf68e12209a0c0ad7051385fa74892494c35628088578625a6a2

66 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 presence of PDF_EVAL and PDF_FROMCHARCODE rules suggests the JavaScript is obfuscated and uses eval() and String.fromCharCode() for execution. Two JavaScript files were extracted, one of which is labeled as deobfuscated. The primary function of the script appears to be downloading and executing a second-stage payload, though the exact URL or execution method could not be fully reconstructed due to obfuscation. The confidence is moderate due to the obfuscation and lack of specific IOCs beyond the extracted script filenames.

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_000.js` `0bd3c0248733fcc11a2655f6a7dfc50ac75635d71537766c0a7b2c3cae711353`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3CE	7149 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).
`deobfuscated.js` `2ec4899d9ee2014792f41930dfc55e0bc6c9194e14ad52be8e1b7e64992c4287`	deobfuscated-js	PDF JavaScript deobfuscation pass	14847 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s).

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