PDF malware analysis — malicious · 540cb5c157897d13

MALICIOUS

PDF

4.2 KB Authoring application: Python PDF Library 055 http072057057pybrary056net057pyPdf057

MD5: db6e672b3f58af221a8fb221dfcff25f SHA-1: 1b9aacb85de1664de7106528dcd78379f4bf7ab5 SHA-256: 540cb5c157897d13dba3254f1b63657664f74ad3a02b65b6bc48548a6eabb32f

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains embedded JavaScript that utilizes the unescape function, a common indicator of exploit attempts. The script appears to be designed for heap spraying and executing shellcode, suggesting it aims to download and run a secondary malicious payload. The specific exploit mechanism and final payload are not fully discernible due to obfuscation and truncation, leading to a moderate confidence level.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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.
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits
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.
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0004_000.js` `121fa4d4ec1ce9c9b06e6d30143bde3d545edce0e1cf8ae1ad3aaf94797a77b2`	pdf-javascript-stream	PDF /JS object 4 at offset 0x14B	3627 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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