PDF malware analysis — malicious · 17bd6f2c59296230

MALICIOUS

PDF

3.2 KB

MD5: 1c517f29b4a9923dd232c2b95274ac5b SHA-1: 14a78324317f08e35edbda79cf80c8d5a3ebf4f1 SHA-256: 17bd6f2c5929623082d0ecb0efe6beae2d95afee99f7ea54d441135d7214a922

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 be designed to exploit a known vulnerability. The script decodes a string from the PDF's title property and then executes it, likely to download and run a second-stage payload. The critical PDF_JS_EXPLOIT_CLUSTER and ML_NYX_PDF_MALICIOUS heuristics, along with ClamAV detection, strongly indicate malicious intent.

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` `13ca1be61fe3c01fad5ce4c63d07559361d06b1da752bd4d294924c3171acdd0`	pdf-javascript-stream	PDF /JS object 7 at offset 0x9C4	514 bytes

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