PDF malware analysis — malicious · 840ed123c558a1cc

MALICIOUS

PDF

5.9 KB

MD5: 7002213b5972b5b846a52673d452f37b SHA-1: e1bfd195ea50aa4cd69c9b0c5950ad9b4d2a7151 SHA-256: 840ed123c558a1ccddb5766790e35c1c289a0bc0674fccf8de84d8f4e68aa179

368 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains obfuscated JavaScript that leverages the unescape() function, a common indicator of exploit code. Heuristics indicate this JavaScript is part of an exploit cluster targeting Adobe Reader's 3D parser, specifically related to CVE-2011-2462, which involves a heap spray. The embedded JavaScript is designed to trigger this exploit, likely to download and execute a secondary payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9995

Heuristics 9

Adobe Reader U3D parser exploit with JavaScript heap spray critical CVE likely CVE_2011_2462_U3D_HEAPSPRAY

PDF combines U3D/3D annotation content with JavaScript heap-spray shellcode. Public CVE-2011-2462 exploit chains use a crafted U3D stream and JavaScript heap spray to control memory during Adobe Reader's U3D parser corruption.
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.
Hex-obfuscated scripting name object critical PDF_OBFUSCATED_NAME_OBJECT

A PDF name object that drives script execution (/JavaScript or /JS) is written with #XX hex escapes to hide it from string-based scanners — e.g. /J#61v#61S#63r#69p#74 decoding to /JavaScript. Legitimate PDF producers always write these names literally; hex-encoding an executable name is a deliberate evasion used by exploit-kit and dropper PDFs.
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: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
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.
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_obj0001_000.js` `c7cebd49601333bd9d760f0b139327ddfcea55dc9bf660cad182a33488aed0d1`	pdf-javascript-stream	PDF /JS object 1 at offset 0xF	3993 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).
`javascript_obj0002_001.js` `53ef3e86395c29047481d41061937b32759780f8b45be9739a0a576f50df45b1`	pdf-javascript-stream	PDF /JS object 2 at offset 0x1105	58 bytes

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