PDF malware analysis — malicious · 1cd5fc983f28008b

MALICIOUS

PDF

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

MD5: d4cefc242df7c60cfca08f4a6999ad18 SHA-1: 2e9ac5869d919728f9257650f510f15dd3de124d SHA-256: 1cd5fc983f28008b8505ef910a52efab5e3f019e8b2b1147b81b914e3f8f2275

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, PDF_EVAL, and PDF_FROMCHARCODE. The primary heuristic, PDF_EVAL, suggests the use of eval() for code execution. The presence of 'javascript_obj0013_001.js' as an extracted artifact further supports this. The obfuscated nature of the script, as suggested by the 'Script obfuscation indicators' in the static triage, implies an intent to download and execute a second-stage payload. The confidence is moderate due to the obfuscation preventing a precise analysis of the script's ultimate goal.

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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_001.js` `1521bc8e3fd415508e4c5a75db2781f1656b660dd0148e80981589f1e628a7c5`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3D2	12503 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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