PDF malware analysis — malicious · 62326e0af8612422

MALICIOUS

PDF

5.3 KB Created: 2008-07-26 19:43:58 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: 7fd7f41e51df3b03d7aecf47801fb7a4 SHA-1: 7b69cff5e4dcfe20f2cd5108efd0638b1bd6de5e SHA-256: 62326e0af86124221aee442dafa8054d44a4dd546f67c06442421833fd36432a

188 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

This PDF file contains obfuscated JavaScript that utilizes eval() and unescape() functions, strongly indicating an attempt to exploit a vulnerability and execute malicious code. The JavaScript is designed to download and execute a second-stage payload, as evidenced by the ML classifier and heuristic firings. The specific payload and its ultimate destination are not fully discernible due to obfuscation, but the overall pattern points to a downloader or dropper.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

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.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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.
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_obj0014_000.js` `76338fcd1e37aae7d6984da4daa5f9e7d008f2d1afb3ea62174443fd4ad3ec85`	pdf-javascript-stream	PDF /JS object 14 at offset 0x38D	74494 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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