PDF malware analysis — malicious · 62d970e025d642a0

MALICIOUS

PDF

3.2 KB

MD5: 82ef8565de8bf79128bf262f41cab538 SHA-1: 8a9698ff73dec054b219bcb550c072be21834f6b SHA-256: 62d970e025d642a0c69118fe09560c330042e72b2b495869c900e0b7088a04cc

206 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 utilizes the unescape() function, a common technique for obfuscating malicious code. The script appears to be designed to execute arbitrary JavaScript, likely to download and run a second-stage payload. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a PDF exploit.

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` `20b1880ca393a3658fde8816ee4bdc82d01820806b1221eb2ebb616dc9bba475`	pdf-javascript-stream	PDF /JS object 7 at offset 0x9C9	479 bytes

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