PDF malware analysis — malicious · bb24f9b97f05b802

MALICIOUS

PDF

28.0 KB Created: 2010-03-16 14:18:40 Authoring application: VkHg3 (via PqcFLbZER0B)

MD5: ebdf4dbb918d24c0f6498de8fd73999b SHA-1: 3ffcd6f68a8c81de0c01552720b24ff96bd8e1d3 SHA-256: bb24f9b97f05b8020a3c276f4dccdfef38814542d3b4da5eb59d0b34d4fbaf59

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream is heavily obfuscated, utilizing String.fromCharCode and an eval() call, as flagged by PDF_FROMCHARCODE and PDF_EVAL. The ML classifier also strongly indicates maliciousness. The primary function of the embedded JavaScript appears to be downloading and executing a second-stage payload, as suggested by the obfuscation and the presence of a large JavaScript file. The authoring application 'VkHg3' and the specific obfuscation techniques point towards a downloader or dropper functionality.

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_obj0007_000.js` `1a1cdbadac9c152ac3534fc24aa45df6454009b710abd09e9cce81259cf003a4`	pdf-javascript-stream	PDF /JS object 7 at offset 0x24A	27489 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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