PDF malware analysis — malicious · 5c467414fd9deaa5

MALICIOUS

PDF

7.1 KB

MD5: 2d556c285c0203bd1399196e418b683e SHA-1: 6af94dc1bce13744a111b1887651dc6c71de88f4 SHA-256: 5c467414fd9deaa56082e78a60b6a9d8cebf00d6bb8192b177945eabb4f99f8f

268 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains obfuscated JavaScript that leverages the CVE-2008-2992 vulnerability (util.printf) to achieve code execution. The embedded JavaScript is designed to deobfuscate and likely download a secondary payload, indicated by the 'PDF JavaScript exploit cluster' heuristic and the presence of multiple JavaScript streams. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

util.printf — CVE-2008-2992 critical CVE exact CVE_2008_2992

PDF JavaScript calls util.printf() — CVE-2008-2992 is a stack buffer overflow in Adobe Reader triggered by a long format-specifier argument. Widely exploited in the wild after disclosure. (matched in decompressed stream)
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_obj0006_000.js` `a70f6df1a7faf9fcb89e8b8c7d404ae24de5753335a395f6e433acbe031bddf7`	pdf-javascript-stream	PDF /JS object 6 at offset 0x193	6076 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `0e31f0f7b5392a56e1e56563ef1c32e0105e3aa9268dc34f4355575d7017fe58`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1FC	512 bytes

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