PDF malware analysis — malicious · 4ff3b7a20e982fcc

MALICIOUS

PDF

7.3 KB

MD5: f028a0f84bb313e555bae430a2c8ebd0 SHA-1: f92ea3678845a66ae47d7cad4b66c520cf2aa239 SHA-256: 4ff3b7a20e982fccd0958391c6c050d79bde843adcfa786aa5dcce66a6767fdd

268 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF sample contains embedded JavaScript and triggers critical heuristics related to the CVE-2009-0658 exploit, which targets JBIG2Decode functionality in older Adobe Reader versions. The ML classifier also strongly indicates maliciousness. The embedded JavaScript, named 'javascript_obj0006_000.js', is likely responsible for executing the exploit and potentially downloading a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9977

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` `5e418ff20f8b06f39626fd63488046f92fb777cf6ab2a156c03bec84e990e76c`	pdf-javascript-stream	PDF /JS object 6 at offset 0x211	5927 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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