PDF malware analysis — malicious · 1d1948b0a4704ca6

MALICIOUS

PDF

1.6 KB

MD5: be204be98331a015982dcc556088dc48 SHA-1: 8cd2ee5d2d4befe487b3f40436141b3b5fcf0dcb SHA-256: 1d1948b0a4704ca66e40f884f3fa6d14dd60b277ee4b028affd80d227442661c

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1059.003 Command and Scripting Interpreter: Windows Command Shell T1059.007 Command and Scripting Interpreter: JavaScript/TypeScript

The PDF file contains obfuscated JavaScript, indicated by multiple heuristic firings including `PDF_JAVASCRIPT`, `PDF_JS`, `PDF_EVAL`, and `PDF_FROMCHARCODE`. The `eval()` call and `String.fromCharCode` are commonly used to deobfuscate and execute malicious code. The ClamAV detection `Heuristics.PDF.ObfuscatedNameObject` further confirms its malicious nature. The primary IOC is the extracted JavaScript file, which is likely responsible for the second-stage execution.

Heuristics 6

ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0009_000.js` `e170ab13d4adf9871670b060284caa88114caa7f5c40a55209fdf1c71f77600b`	pdf-javascript-stream	PDF /JS object 9 at offset 0xDC	3907 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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