PDF malware analysis — malicious · 0453d5e575a2b1d4

MALICIOUS

PDF

3.3 KB

MD5: 742a3da0d98ed4c61663d5513b82d091 SHA-1: 915d2b7f71df1673ad6f166b4a6cad78d0178b6c SHA-256: 0453d5e575a2b1d46c9d6aef47223f464442e7f4cae2c66ca72c0cab0f8dbb25

206 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript that is obfuscated but appears to decode and execute a string derived from the document's title. This JavaScript is likely responsible for exploiting a known PDF vulnerability to achieve arbitrary code execution. The presence of PDF_JS_EXPLOIT_CLUSTER and ML_NYX_PDF_MALICIOUS heuristics, along with ClamAV detection as Pdf.Exploit.Agent-36121, strongly indicates malicious intent, likely involving the download of a secondary payload.

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` `572bedb10f0d187f0e56348ab7cf96f72b7c4a2254008913b079957579bd1878`	pdf-javascript-stream	PDF /JS object 7 at offset 0xA88	343 bytes

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