PDF malware analysis — malicious · b25d8bbddd77bdc7

MALICIOUS

PDF

34.5 KB Created: 2009-07-25 04:06:52 Authoring application: qxMdbkUIlbFcRxaiY (via QkkVnPgQnQTBwJULqRp)

MD5: 9a1e69bbefdab5927e457d4be50e1007 SHA-1: 69fed3d2bc9bb5a0c909a45895229b97ba9258af SHA-256: b25d8bbddd77bdc7ea51a9680b6439c3ccc785e1321d3cd64909b1d571e1d6df

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of PDF_EVAL and PDF_FROMCHARCODE suggests obfuscation techniques were used to hide the script's true functionality. The ML classifier strongly flags this PDF as malicious. The extracted JavaScript file, javascript_obj0019_000.js, is the primary artifact, and its obfuscated nature points towards it downloading and executing a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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_obj0019_000.js` `82f160ca25989cf8af678b5321f61087bf1c534a08e78782cb1849f09ed669ab`	pdf-javascript-stream	PDF /JS object 19 at offset 0x482E	15781 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 12 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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