PDF malware analysis — malicious · 1ebce1ac5b5f14bc

MALICIOUS

PDF

28.7 KB Created: 2010-12-30 23:33:00 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: 5e89798200507ffb6287576df5da8b77 SHA-1: 965bc9e565269e32c0406c1ba925be547b39a754 SHA-256: 1ebce1ac5b5f14bc84d6304a60b2911cffddbca8541e6e88c156d71f713ba9d8

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1027 Obfuscated Files or Information T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The deobfuscated JavaScript, named acroform_b64_00.js, uses eval() and String.fromCharCode, suggesting it's designed to execute obfuscated code. This pattern is commonly used to download and execute a second-stage payload. The confidence is moderate due to the obfuscation and lack of a specific family signature.

Heuristics 5

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
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.
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
`acroform_b64_00.js` `4b0e925b23ac59fd9c45fd59fe8e1744b41e2bd46a1858311691e5cf6a4f2723`	deobfuscated-js	PDF AcroForm base64 (raw) at offset 0x61BC	1638 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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