PDF malware analysis — malicious · 0bd0262b5c6ce489

MALICIOUS

PDF

3.5 KB Created: 2008-09-24 19:47:56 Authoring application: Adobe (via Notepad)

MD5: f2295b8375bd7a9009e7a21ee28368bd SHA-1: ce36bc9b3fd6e3bcf7b84a7ff315f3ac56f7f3e9 SHA-256: 0bd0262b5c6ce4890a8b40e15843d21127a7a8977e8a192f23bccaf6b83ecf63

248 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript that utilizes `unescape` and `eval` functions, indicating an attempt to execute obfuscated code. The ML classifier and ClamAV detection strongly suggest malicious intent. The script's primary function appears to be decoding and executing further malicious code, likely a downloader for a second-stage payload, as evidenced by the `PDF_JS_EXPLOIT_CLUSTER` heuristic.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

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.
ClamAV: Pdf.Dropper.Agent-7227581-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7227581-0
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_obj0006_000.js` `a1c24bdfd2c62b7a57ca5c4f7c80a5667aabe3379f407f941eb5a9c44fd7d80b`	pdf-javascript-stream	PDF /JS object 6 at offset 0xB36	191 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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