PDF malware analysis — malicious · def0f0462f05347e

MALICIOUS

PDF

172.6 KB

MD5: 62461565d1e45614193f9d73568b9d15 SHA-1: 4da91ae28d8c96ebe71321b746a779658f670ce0 SHA-256: def0f0462f05347e48c33e8101ba7dd83d961383841dd420f00fb4abc263b6c5

356 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 PowerShell

This PDF file is flagged as malicious by multiple heuristics and a machine learning classifier. It contains embedded JavaScript that is obfuscated but appears to be designed to exploit CVE-2010-2883, a known vulnerability in Adobe Reader. The script likely attempts to download and execute a secondary payload. The presence of XFA forms and JavaScript actions strongly suggests an exploit delivery mechanism.

Machine Learning

Nyx PDF Classifier malicious score 0.9688

Heuristics 9

Adobe Reader CoolType SING font exploit — CVE-2010-2883 critical CVE likely CVE_2010_2883

PDF embeds a TrueType/OpenType font with an actual SING table and pairs it with JavaScript heap-spray shellcode. This matches the public Adobe Reader CoolType SING exploit shape for CVE-2010-2883.
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.
Secondary embedded PDF body has suspicious static findings critical POLYGLOT_CHILD_PDF_STATIC_TRIAGE

A valid PDF body was found at a nonzero offset inside another container and its carved contents matched PDF exploit or lure heuristics. This catches polyglots where the top-level magic routes to ZIP/OLE while a PDF reader or downstream parser opens the hidden PDF payload.
ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
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
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://ns.adobe.com/xdp/
- http://www.xfa.org/schema/xci/2.6/
- http://www.xfa.org/schema/xfa-template/2.6/

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `9686437f164b152ee4eb69bbb4795b3cf43b16c1d456aa2ea4fab74661fbe7fb`	pdf-javascript-stream	PDF /JS object 6 at offset 0x25D	5170 bytes
`polyglot_child_pdf_off0002001d.pdf` `e57c24eae67eb0263c317ef4f5f12e1aea1a21616cc47bc9621679f0110af3bd`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0x2001D	45599 bytes
Detection ClamAV: Heuristics.PDF.ObfuscatedNameObject Obfuscation or payload: unlikely

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