PDF malware analysis — malicious · cdc700755b4c5f88

MALICIOUS

PDF

28.2 KB Created: 2010-03-12 18:18:59 Authoring application: sLlVrK (via kYdcoJCa)

MD5: eb9554e487d4d33f3278da95b13c1596 SHA-1: 4a07c05dd423454660bbf30d6c6ce5b6de501033 SHA-256: cdc700755b4c5f885a952f70a1053b4b6065db8aaa54c36feb7054aa4300a511

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The ML classifier strongly indicates maliciousness. The JavaScript stream, named javascript_obj0007_000.js, is heavily obfuscated using String.fromCharCode and eval(), suggesting it's designed to download and execute a second-stage payload. The authoring application 'sLlVrK' and associated strings may indicate a specific toolset or family, but without further context, the family is classified as unknown.

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` `09f32a1014a57b495933315d25e7f1854b449f5cf26b908b62b5b48d9b70fd8c`	pdf-javascript-stream	PDF /JS object 7 at offset 0x23A	27669 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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