PDF malware analysis — malicious · 431fda25917238f1

MALICIOUS

PDF

28.1 KB Created: 2010-03-06 03:33:41 Authoring application: sIR59hQ (via VcqaBb5vDXSPs)

MD5: 63c2da52d39de53bf9476ca001ef25f4 SHA-1: 0238b015d566dd2967bbea27f138e21c1c3955b0 SHA-256: 431fda25917238f110556ea102e55ba77e054ad2aa3fec95d30543b3ac0881aa

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1204.002 Malicious File Execution: Malicious JavaScript

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The high-severity PDF_EVAL firing suggests the use of eval() for obfuscated code execution. The embedded JavaScript file, javascript_obj0007_000.js, is the primary artifact. The script's purpose is likely to download and execute a second-stage payload, a common technique for initial access.

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.
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_obj0007_000.js` `4501792a2a6399eb0d20c1be769cc07f7a98f5b86de1204135b5afdc8df4f08f`	pdf-javascript-stream	PDF /JS object 7 at offset 0x23F	27516 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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