PDF malware analysis — malicious · 6c6b3802c64a31e8

MALICIOUS

PDF

4.2 KB

MD5: 9666cf5956922b4127c600b6a01f8488 SHA-1: e91b4ac608cd19dc46e9548bac0c27a38f05a9ed SHA-256: 6c6b3802c64a31e8fced484bebf5d4e82241cbfd66fa2ade8c86d8c52de97655

268 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF file contains embedded JavaScript that is heavily obfuscated and appears to be designed to exploit a known vulnerability. The script utilizes unescape() to decode a shellcode payload, which is then likely executed. ClamAV detections confirm this is a malicious dropper, and the presence of JavaScript points to T1059.007. The overall behavior suggests exploitation for client execution (T1203) and likely delivery via spearphishing attachment (T1566.001).

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.Dropper.Agent-7270065-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7270065-0
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
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_obj0035_000.js` `f4c854909aa7c28cde5cd8001a16d83e3b7de4b3d0bcb0c4cafd9950700f899b`	pdf-javascript-stream	PDF /JS object 35 at offset 0x937	2702 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 35 eval/decoder/string-building token(s).

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