PDF malware analysis — malicious · b9a93b71dcfd378b

MALICIOUS

PDF

3.5 KB Created: 2009-03-28 17:53:02 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: 8407c07b506c20da67b60ce6e2bbc0c9 SHA-1: 4e773deb7233738d60bdaaae4b56407c1aaa2c9f SHA-256: b9a93b71dcfd378b545e1f376221f7473b6e0c5048cd8f0fac0da6d5653de4c9

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1059.003 Command and Scripting Interpreter: Windows Command Shell T1204.002 Malicious File: Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The JavaScript stream is obfuscated and contains eval() calls and String.fromCharCode, suggesting it is designed to deobfuscate and execute malicious code. The presence of 'deobfuscated.js' further supports this. The likely intent is to download and execute a second-stage payload, although the specific URL or execution method is not directly extractable from the provided evidence. The confidence is moderate due to the obfuscation.

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` `9dce8c8faf7c0e00400373341d8a5c542033c8716f10b9befba78ef524e4edcb`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3CE	7148 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` `abac79985364e26def2691ab5eae1158f461aa55b3b1484a11d11de99d8d0849`	deobfuscated-js	PDF JavaScript deobfuscation pass	15245 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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