PDF malware analysis — malicious · 0e623adb6c97ef0e

MALICIOUS

PDF

3.4 KB

MD5: 0f3f2cc75e8c9a42fc235f1d7a14ee4d SHA-1: 6aa3c11b510bc6864f29e651425bbadb431083e5 SHA-256: 0e623adb6c97ef0e161858d4311c0eaec59de7f8471b0821be2a2238715cdd4a

156 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF file contains embedded JavaScript that is heavily obfuscated using string concatenation and character code decoding. The script appears to be designed to download and execute a second-stage payload, indicated by the PDF_JS_EXPLOIT_CLUSTER and PDF_FROMCHARCODE heuristics. The presence of U3D content also suggests a potential exploit targeting Adobe Reader's 3D parsing capabilities. The overall behavior points to a malicious document likely delivered via spearphishing.

Machine Learning

Nyx PDF Classifier malicious score 0.9996

Heuristics 6

U3D/3D content in PDF — Adobe Reader 3D parser CVE-family indicator high CVE related PDF_U3D_CVE_RELATED

PDF contains U3D (Universal 3D) or 3D annotation content — CVE-2011-2462 and CVE-2009-3953 are critical vulnerabilities in Adobe Reader's U3D processing that allow arbitrary code execution. U3D content in PDFs is extremely rare in normal documents.
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.
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. (matched inside decoded stream)
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_obj0005_000.js` `ad0f40252fdf046315040f0663e2eda92cb726c7060a166e5ef5d1499573959e`	pdf-javascript-stream	PDF /JS object 5 at offset 0x10D	9469 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`u3d_00_off00000ade.bin` `ff5a9c8be4ea5f95aad6bf628c0c722680a378131b2902f434e3c654deea1d60`	pdf-3d-stream	PDF U3D 3D stream at offset 0xADE	468 bytes

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