PDF malware analysis — malicious · dba19b450b1ca37f

MALICIOUS

PDF

27.8 KB Created: 2010-03-12 14:20:31 Authoring application: Fny2BfOpi (via hU8efegxgND50)

MD5: f12f6ad95097a4a21e9bf8f45f658469 SHA-1: 3215ed056ccbf3d97b08b25eedc94cde4201121b SHA-256: dba19b450b1ca37fbdc6ca71e7a9c08426663913ff553e13b344ae387acd73f9

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file 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 highly obfuscated, preventing a detailed analysis of its specific actions. However, the presence of eval() and String.fromCharCode suggests code execution and obfuscation techniques commonly used to download and execute further payloads.

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` `d1dd5242ea54de1b77c4924d12ed9b205f910448400dad51a772608ad7edb34a`	pdf-javascript-stream	PDF /JS object 7 at offset 0x243	27191 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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