PDF malware analysis — malicious · d1ec8dc175c8900a

MALICIOUS

PDF

6.7 KB Created: 2009-11-17 23:22:12 Authoring application: Scribus 1.3.5svn (via Scribus PDF Library 1.3.5svn)

MD5: 454beb9fe5e5078f49b83b0aa70238ab SHA-1: 0628bee764d866c36ca8f4914e2096ac7fef5c31 SHA-256: d1ec8dc175c8900a739a3691083d83b17a50ff30dea9fcc5680417c1eda5b784

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT' and 'PDF_JS'. The 'ML_NYX_PDF_MALICIOUS' classifier strongly suggests malicious intent. The embedded JavaScript, named 'javascript_obj0018_001.js', is likely responsible for executing the malicious payload. The presence of 'unescape()' and 'String.fromCharCode()' suggests obfuscation techniques were used within the script.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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_obj0018_001.js` `d478bc00a570c7b7ed8c0736a541b28c720f9da6e3bd5d0d72226fbe6c319b0b`	pdf-javascript-stream	PDF /JS object 18 at offset 0xD2B	12549 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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