PDF malware analysis — malicious · a35f4773172ff01f

MALICIOUS

PDF

7.0 KB

MD5: f3c95d47b874c7f361dfa9a7ac4aea9c SHA-1: f75991f95fc895cf8f00fd4d224fbbd244c3dbac SHA-256: a35f4773172ff01f2c3d9fb1bffaa3280c2a928d1063d4c38bf042bbba9bf6ea

268 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1204.002 Malicious File

The PDF file contains obfuscated JavaScript and triggers a critical heuristic for the CVE-2009-0658 exploit, which targets Adobe Reader. This exploit likely leads to the execution of malicious code, as indicated by the ML classifier and ClamAV detection. No document body text was available for analysis, but the presence of the exploit and JavaScript strongly suggests an attempt to compromise the user's system.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

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` `2bd2b2d2651397ce1cc1fe119f009a94d5ec3dce96e11c50a321d2037a63b144`	pdf-javascript-stream	PDF /JS object 6 at offset 0x23D	5645 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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