PDF malware analysis — malicious · 84c90c46d771e62a

MALICIOUS

PDF

3.2 KB

MD5: 77814f734230a052a21be52f0d0197dd SHA-1: 44102c21793af519ad9d21e279145ab370bcc450 SHA-256: 84c90c46d771e62a33637d3894145416361927a25593ef07dd18b711451c2d20

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 is obfuscated but appears to leverage the unescape() function, a common technique in PDF exploits. The JavaScript is designed to execute code, likely downloading and running a secondary payload. ClamAV detection and ML classification strongly indicate malicious intent, pointing towards an exploit targeting PDF viewers.

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` `e536e69ab6d8bbfbf36bb01096521f87ac225714c7f0cd8b73eaeac19beea752`	pdf-javascript-stream	PDF /JS object 7 at offset 0x9C9	502 bytes

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