PDF malware analysis — malicious · cd4b6cd765d4ae05

MALICIOUS

PDF

1.6 KB

MD5: 12832f0d3fccaf86eaea42202a90cd2c SHA-1: 132d02917f54e8b3a4f1f03a0e8a676b5c742826 SHA-256: cd4b6cd765d4ae05c0da668e04e3c0d4deb04f4ba6c030785a9359a914abe8e7

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_EVAL'. The 'PDF_EVAL' and 'PDF_FROMCHARCODE' firings suggest the JavaScript is obfuscated and uses dynamic code execution. ClamAV also flagged this as 'Heuristics.PDF.ObfuscatedNameObject'. The embedded JavaScript file 'javascript_obj0009_000.js' is the primary artifact, and its obfuscated nature points towards an attempt to download and execute a second-stage payload.

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` `7a1a078142a9d792e41fc767d04d31a2b31dd359726343b0ca82bbc1f62bbcda`	pdf-javascript-stream	PDF /JS object 9 at offset 0xDC	3910 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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