PDF malware analysis — malicious · 6d69e9e3962c7800

MALICIOUS

PDF

3.1 KB Created: 2008-08-03 07:51:49 -09:03 Authoring application: Adobe InDesign CS3 (5.0) (via Adobe PDF Library 8.1)

MD5: 1091c3cc8a052800db3e0b4be47e88fd SHA-1: 8eea2c024a290771b3aa023d379961fba8a4c523 SHA-256: 6d69e9e3962c78005e424bb20879e97d653d6f92c5c67fdc2c6c433ffa318bf0

150 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains obfuscated JavaScript that attempts to exploit a vulnerability. The script decodes a URL and attempts to download a file named FSKrec.exe from the IP address 66.96.207.64. This indicates the sample is designed to act as a downloader for a second-stage payload.

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.
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.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.

URL http://66.96.207.64/FSKrec.exe?id=0&sid=073407370032013200310c5f0a375e2e41295a3b063305340d3b0a32&e=98

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_001.js` `cd92cef6f0c1cb3e3df0a11019c58e1c64b300aa60b652d0701379e30ed33180`	pdf-javascript-stream	PDF /JS object 13 at offset 0x37E	2631 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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