PDF malware analysis — malicious · 6d219218dc62ab6b

MALICIOUS

PDF

3.2 KB

MD5: a8a81b77ba81caf898490d5e7da1a906 SHA-1: a3bd2bd7731e0c109168ea768f9deed845f0f572 SHA-256: 6d219218dc62ab6b874d02b16b7d094eacb0e22054f7fa5e34f2c4c14165341b

206 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF sample contains embedded JavaScript that uses an unescape function, a common technique for obfuscating malicious code. The script likely decodes and executes a payload. The ML classifier and ClamAV detection strongly indicate malicious intent, pointing towards an exploit targeting PDF viewers. The specific exploit cluster and ClamAV signature suggest a known exploit, but without further context, the family remains unknown.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 5

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-36121 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36121
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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `c1b277b2bd9f373e07d4e466246372d0486d0e1447d26af5b750d5ded46179d2`	pdf-javascript-stream	PDF /JS object 7 at offset 0x9C9	485 bytes

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