PDF malware analysis — malicious · 417e71659a203fd0

MALICIOUS

PDF

22.3 KB Created: 2011-72-51 03:25:00 Authoring application: String.fromCharCode

MD5: 8680f0080fd82d88fa07128760a483af SHA-1: 2cdeb6b87c13b586e5c04f67a62ce79dd0ed2d9c SHA-256: 417e71659a203fd07c02d75e1604050384c0993c0f7f1eff6c6ad249d75b2986

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file contains embedded JavaScript that utilizes String.fromCharCode and eval() to execute obfuscated code. This script is likely designed to download and execute a second-stage payload from a remote source, indicated by the presence of a suspicious extracted JavaScript file. The confidence is moderate due to the obfuscation and lack of specific indicators for a known family.

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_obj0001_000.js` `35e88a4d26bb61be66005ec343e55df13cedb27c9d5cf168e45a980ecea9a1cf`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	538 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).

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