PDF malware analysis — malicious · 753ce6c36f81322f

MALICIOUS

PDF

20.1 KB Created: 2009-10-09 19:42:11 Authoring application: PDF Library 2.2.8 (via PDF Library 7.7.6)

MD5: b1bba41f1f4956141f3a77f2020286df SHA-1: 7cc06bcc72e946fa8ebb07947e28e675ccdae84a SHA-256: 753ce6c36f81322fe748ba9936cb35657baa2c2eee7382d17f875f7a0c762b55

186 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF contains obfuscated JavaScript, indicated by multiple heuristics including PDF_UNESCAPE and PDF_JS_EXPLOIT_CLUSTER. The JavaScript is designed to download and execute a secondary payload, as evidenced by the ML classifier's high confidence in maliciousness and the presence of an embedded JavaScript file. The specific URL for the payload download is obfuscated within the script.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

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 (matched inside decoded stream)
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
Suspicious extracted artifact medium 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.
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` `5b16f4912277199919f3bb0546f2389ed74b0aca7d1d104b0c1368880689bc8d`	pdf-javascript-stream	PDF /JS object 7 at offset 0x268	22114 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long hex-escaped blob(s).

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