PDF malware analysis — malicious · 9f961f02e7d6e55e

MALICIOUS

PDF

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

MD5: a6bb6cf5d1bbdc11feceb3368ff156aa SHA-1: a607f8b9eefedee7b7d86adb0d57ad4e692a500e SHA-256: 9f961f02e7d6e55eb6d4745ab03de0e7ef0cf875b3f40d46c81b3dc08836f40f

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File: User Execution: Malicious File

This PDF sample was flagged as malicious by a machine learning classifier and exhibits multiple JavaScript-related heuristics, including embedded JS streams and the use of `String.fromCharCode` and `eval()`. The presence of `eval()` strongly suggests the execution of obfuscated JavaScript code, which is commonly used to download and execute further malicious payloads. No specific family could be identified, but the attack pattern is consistent with a malicious PDF dropper.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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` `9eb702a2c0e9f3177d3aee8ed8d5fc2fae7eaa540981893664083b961d748bf9`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	526 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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