PDF malware analysis — malicious · 39613bd84e7c7da5

MALICIOUS

PDF

1.6 KB

MD5: 78626198067915de8f5a12dc1d8d9058 SHA-1: 0322879dfebec34ddef3ab89cba6371428bc2d1b SHA-256: 39613bd84e7c7da58f961a5cd678efb7058632237136887066cd68303d704b47

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

This PDF file contains obfuscated JavaScript, indicated by multiple PDF-specific heuristics including `PDF_JAVASCRIPT`, `PDF_JS`, and `PDF_EVAL`. The embedded JavaScript stream, named `javascript_obj0009_000.js`, likely contains code designed to exploit vulnerabilities or download further malicious content. The `eval()` call and `String.fromCharCode` usage are common obfuscation techniques used to hide malicious JavaScript 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` `66736d8fa456e4c85d76360da1009f777fa0677695fb6f45e62ec0a012b7d5c2`	pdf-javascript-stream	PDF /JS object 9 at offset 0xDC	3898 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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