PDF malware analysis — malicious · 75d2e76e105cec4a

MALICIOUS

PDF

13.3 KB Created: 2010-02-15 16:12:18

MD5: 2b466f9aeaef811c9b2b64cea1cf211c SHA-1: b5759ab5fca32e89dab513f4a11e7f5ea381b9aa SHA-256: 75d2e76e105cec4abbc41b21d63a101a70fde060f87563e6ac27f1511a7332c9

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript that utilizes an eval() call, a common technique for executing obfuscated or dynamically generated code. This JavaScript is likely responsible for downloading and executing a secondary payload, as indicated by the PDF_JS_EXPLOIT_CLUSTER heuristic. The ML classifier strongly suggests malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

JavaScript action low 2 related findings PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
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_obj0023_000.js` `782a8114e9910c86983cd6ac29c83a99a6eaffce4b41964b6630a3012a395fc1`	pdf-javascript-stream	PDF /JS object 23 at offset 0x2F12	88 bytes
Preview script First 1,000 lines of the extracted script var windowLength='title', Window=Function; var dd=this.info[windowLength]; Window(dd)();
`stream_009_off00003112.js` `364c75ab948291a3b2d2e6705ebd225b5ede2f9c883834822b11ef3e4de9eb3e`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x3112	298 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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