PDF malware analysis — malicious · 5f79400cb6bd713d

MALICIOUS

PDF

11.3 KB

MD5: 0739c5345f22f7ce068e92cafa599a74 SHA-1: bb7c20d98e9f1074fcd9f889d0f183d5ab53957d SHA-256: 5f79400cb6bd713dfa9804110afe3c832f14481bbfa45cd83643a31995b5492b

216 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains embedded JavaScript streams that utilize obfuscation techniques such as eval() and String.fromCharCode. These scripts are designed to execute malicious code, likely downloading and executing a secondary payload. The critical heuristic firings for PDF JavaScript exploit cluster and ClamAV detection confirm the malicious nature of the file.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

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-5466 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-5466
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape 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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `2bf527249ee82ad88b93a8a554a01825ff6c03769bfb11c174ec181f224d0887`	pdf-javascript-stream	PDF /JS object 7 at offset 0x297	10598 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`javascript_obj0007_001.js` `f0d7a81dedb5f6c3c3f03208ce3441a5d4c1426aaac248ba22b9a86476b7dab5`	pdf-javascript-stream	PDF /JS object 7 at offset 0x297	9847 bytes

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