PDF malware analysis — malicious · 37c1064985707ee4

MALICIOUS

PDF

6.5 KB

MD5: d1df094d1429eba929a7c371ada2181f SHA-1: 3cd5b7b73bb8f24b4c311aaffd2b76ee8a9b02b1 SHA-256: 37c1064985707ee40d3100291da4227d95fd638de274c4a35a4794f280a79547

238 Risk Score

Malware Insights

This PDF file contains embedded JavaScript and triggers critical heuristics related to the CVE-2009-0658 exploit, specifically involving JBIG2 decoding and generic heap-spraying. The presence of obfuscated JavaScript, identified by ClamAV as Heuristics.PDF.ObfuscatedNameObject, strongly suggests the execution of malicious code. The primary attack vector appears to be exploiting a known vulnerability in older versions of Adobe Reader to achieve arbitrary code execution, likely for downloading and executing further stages of malware.

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` `578845437592d563c9443757104717246ef24745f8cd8157828cd43506d77a20`	pdf-javascript-stream	PDF /JS object 6 at offset 0x210	5141 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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