PDF malware analysis — malicious · 59b07d2ddbfb1da7

MALICIOUS

PDF

7.4 KB

MD5: 995845360cc4d104448f680c44d7198d SHA-1: bcf1e3826cbbe8722e3404c729a98127215c74df SHA-256: 59b07d2ddbfb1da7222439d0f77cc832c829cb1c3fcda3ba0be62900718ca269

268 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 PowerShell

The PDF file contains embedded JavaScript and triggers critical heuristics related to the CVE-2009-0658 exploit, specifically a generic heap-spray exploit targeting JBIG2Decode. The ML classifier also flagged this as highly malicious. The embedded JavaScript, although obfuscated, is indicative of malicious intent, likely to download and execute a secondary payload. The presence of JBIG2Decode with active content further supports the exploit vector.

Machine Learning

Nyx PDF Classifier malicious score 0.9970

Heuristics 8

Adobe Reader JBIG2Decode generic heap-spray exploit critical CVE likely CVE_2009_0658_GENERIC_SPRAY

PDF combines JBIG2Decode image streams with JavaScript heap-spray or decoder scaffolding. This is likely CVE-2009-0658-family Adobe Reader JBIG2 exploitation, but it lacks the stricter Reader-9 version gate or decoded page-word shellcode fingerprint required by the exact rule.
JBIG2 + active content high CVE related PDF_JBIG2_ACTIVE_CONTENT

JBIG2Decode appears with JavaScript/XFA/RichMedia — a related indicator for JBIG2 parser-exploit families including CVE-2021-30860 and CVE-2009-0658, but not a unique CVE fingerprint.
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)
JBIG2Decode filter medium PDF_JBIG2

JBIG2 image decoder present — historically used in zero-click exploits
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `139be11fe8fb4746f0f6d48e6d98e3de50d834df3d44b1526a61a187675a494a`	pdf-javascript-stream	PDF /JS object 6 at offset 0x224	6013 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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