PDF malware analysis — malicious · d63fd5503843496d

MALICIOUS

PDF

13.6 KB

MD5: 517ee5788f07ae3a3eaac73806c50982 SHA-1: c509561ad98edf4b79430ce82623322cc4a9d083 SHA-256: d63fd5503843496df63d122fe67c1dab70ad4e3f7d2ffa69644f7b46f9f53e7a

224 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious Link T1566.002 Spearphishing Attachment

This PDF sample was flagged as malicious by a machine learning classifier and ClamAV, identifying it as Pdf.Dropper.Agent-1506749. High-severity heuristics indicate the presence of JavaScript and exploitation of a U3D/3D content vulnerability (CVE-related). The embedded JavaScript, likely obfuscated, is designed to download and execute a secondary payload, which is a common dropper behavior. The presence of JavaScript actions and unescape calls further supports this malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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-1506749 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-1506749
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` `5d5dfdca8116a7c3ec461c18bc477d1082d523c05bf80778ecb33727c5ce5ee6`	pdf-javascript-stream	PDF /JS object 15 at offset 0x7D6	13210 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s). Carved artifact contains 1 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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