PDF malware analysis — malicious · 835dd11725261580

MALICIOUS

PDF

3.2 KB

MD5: 4feb4124bc8da66b2616d6ae1cbc4256 SHA-1: 8bc652ddf3212b3c11f4e28c32c33ef5880c7ffc SHA-256: 835dd1172526158067c02cc4d54ef07acb775150c4f16976d70d464d2c8de9a0

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 utilizes the unescape function, a common indicator of exploit code. The script appears to be designed to download and execute a secondary payload, as suggested by the heuristic firings related to PDF JavaScript exploits and the ClamAV detection signature 'Pdf.Exploit.Agent-36121'. The ML classifier also strongly indicates maliciousness.

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` `c5701399494c0f4b56320b9ad1408f2f197324aeaa35d5e6bb4de612156ff092`	pdf-javascript-stream	PDF /JS object 7 at offset 0x9C6	459 bytes

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