PDF malware analysis — malicious · a4078298865be9a1

MALICIOUS

PDF

30.3 KB Created: 2009-05-01 21:21:45 Authoring application: ghjkSFghjkCPx (via afdsdgf)

MD5: eab71d7630b42640bf593bbc98bfdc58 SHA-1: 6a089d89b9bbc1e6e669fc31b138816b2bae1d25 SHA-256: a4078298865be9a1145adb7f4ce09b8c3f8549dde61b2d72d102516935a7911a

90 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1059.003 Command and Scripting Interpreter: Windows Command Shell T1059.007 Command and Scripting Interpreter: JavaScript/TypeScript

The PDF file contains embedded JavaScript streams, with high-confidence heuristics indicating the use of eval() for obfuscated code execution. The ML classifier strongly suggests malicious intent. The JavaScript is heavily obfuscated, making it difficult to determine the exact payload, but the presence of eval() and multiple JS streams points to a downloader or exploit execution mechanism.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
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.
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `00bae0d20263ec4bc382276fad6dfc4e81876582f7917974d2edfc022d0e8fe0`	pdf-javascript-stream	PDF /JS object 7 at offset 0x21C	29798 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).
`javascript_obj0007_001.js` `b4662f496d2b107447d880bd052c19413ddeddcf429f86171e1d0a886c4fe207`	pdf-javascript-stream	PDF /JS object 7 at offset 0x21C	28827 bytes

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