PDF malware analysis — malicious · 65773ef6193c3507

MALICIOUS

PDF

7.2 KB

MD5: c4d941ad5f368712e8a34b4b32818fcf SHA-1: d8b5a4e07867b9b778b2254ecfe60cbaabb1b07b SHA-256: 65773ef6193c35070ff7d03bfa76170f9c10b00fec281f1f2455554c9b164ab1

268 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript that leverages the CVE-2008-2992 vulnerability, indicated by the 'util.printf' heuristic. The JavaScript is obfuscated and likely intended to download and execute a second-stage payload. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

Nyx PDF Classifier malicious score 0.9960

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` `067ec19a155c75ff6a300c6d9ba26442a96d5d54a7f338809bc534f56716cd39`	pdf-javascript-stream	PDF /JS object 6 at offset 0x18F	6035 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `e6c69ff81fee1129bc14489d1560e6e7c02376f4edebcb5ba31c84657d12b3c8`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1FA	512 bytes

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