PDF malware analysis — malicious · 1ef2c8e4f9f349aa

MALICIOUS

PDF

17.4 KB

MD5: 4f234cc4cf3ec00632d8c5b372a79830 SHA-1: 24c5a87355c58108794c90ddb22e49f02c5a7f93 SHA-256: 1ef2c8e4f9f349aa84b173bca81ca17866414d1a68221d5bbfa16a7c8f29c123

224 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 PowerShell

The sample is a PDF file flagged as malicious by ClamAV (Pdf.Dropper.Agent-1507056) and a machine learning classifier. High-severity heuristics indicate the presence of JavaScript and U3D content, specifically pointing to a CVE-related vulnerability in Adobe Reader's 3D parsing. The PDF likely uses this vulnerability to execute embedded JavaScript, which is designed to download and execute a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 9

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.
ClamAV: Pdf.Dropper.Agent-1507056 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-1507056
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
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.
XFA form low PDF_XFA

PDF uses XML Forms Architecture — can contain script logic
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_obj0015_000.js` `338aab89e9b69716625c01c4bd1f8ecff01baa7b05019d9e967d8e5b2bc2e84f`	pdf-javascript-stream	PDF /JS object 15 at offset 0x7D6	13314 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s).
`u3d_00_off000003cb.bin` `db47f9e6c2fa22cca9aaaaba842bc1035f54c0acd3737dbd64b69dc1671da5eb`	pdf-3d-stream	PDF U3D 3D stream at offset 0x3CB	1268 bytes

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