PDF malware analysis — malicious · 05cbb9538330a9fd

MALICIOUS

PDF

3.2 KB

MD5: dc382f830c83b7b66e575eabe3c34f13 SHA-1: 2a5fde060d460a0c76e2c402f7452a5242f7f403 SHA-256: 05cbb9538330a9fdf7e8df19d10203a95ec7382200426cc134e6d79b93c554cc

206 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF sample contains embedded JavaScript that utilizes the unescape function, a common indicator of exploit code. The script attempts to call a function derived from the document's title property, which is obfuscated. This pattern strongly suggests the exploitation of a PDF vulnerability to achieve arbitrary code execution, likely for downloading and executing a second-stage 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` `6bad106248812a76b1cb7e049c12df56e23c86c53b160b81d85039557eae3d99`	pdf-javascript-stream	PDF /JS object 7 at offset 0x9C4	465 bytes

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