PDF malware analysis — malicious · fcf9bc3fc7109db4

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: 5c30e308baa1adbc366e668561db511e SHA-1: fa70a5a8272151ba7862cad2c1a33b7695029b01 SHA-256: fcf9bc3fc7109db407d6f5068f936c99547d409814f3f32897ed670762fad4da

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, and PDF_EVAL. The presence of eval() and String.fromCharCode suggests obfuscated code execution. Two JavaScript files were extracted, one of which was deobfuscated. The deobfuscated script likely attempts to download and execute a second-stage payload, which is a common technique for malware delivery. The confidence is high due to the clear presence and nature of the JavaScript execution.

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` `7dd826183ca654c40d04df3357b4b72dd66e7b18573faafd99c3d5c571725867`	pdf-javascript-stream	PDF /JS object 13 at offset 0x36A	6778 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` `e322bf6cb03b32682b4fb417b29e431ffb9814a5570ac72374e1dbdd8bed791b`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x727	4402 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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