PDF malware analysis — malicious · 75ff3d1917f0cfff

MALICIOUS

PDF

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

MD5: 30536818496a5f6a0688e18b54bdbf57 SHA-1: 6a000d426fe3784a7a5aa28e25804df1d230a025 SHA-256: 75ff3d1917f0cfffb3415f164a449dec0640c40a52d161e6fe07120f451911f1

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 eval() and unescape() functions, indicating an attempt to obfuscate and execute malicious code. The script is designed to exploit known vulnerabilities in older versions of Adobe Reader. The primary function of the script appears to be downloading and executing a second-stage payload, as suggested by the exploit cluster heuristics and the ML classifier.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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.Exploit.Agent-35931 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35931
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `bcb87029be6ae37c7a132ec1da5a8bc1f92f39d51c96384cf309984d63d777e5`	pdf-javascript-stream	PDF /JS object 6 at offset 0x40E	1516 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`stream_000_off0000016d.js` `141c3f4fe5028a945c8268e79e4bc738e0b977c521b3256265e0064778a150c5`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x16D	2473 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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