PDF malware analysis — malicious · 655549bc0a889e6d

MALICIOUS

PDF

5.7 KB

MD5: 81f0fdf1f73f00e0eb7ab42942b7681a SHA-1: b245191842c9303704ae41b5e89718220748f9f2 SHA-256: 655549bc0a889e6dc24df890babf0d2466210ed1c10da3875706e23e2f6b83b2

268 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF file contains obfuscated JavaScript that exploits CVE-2008-2992 using the util.printf function. The JavaScript is designed to download and execute a secondary payload, indicated by the ML classifier and ClamAV detection. The primary attack vector is likely spearphishing attachment, leading to client execution via the embedded script.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `09aa0cce9cea426155fe9a512ec73c20bcb8a11ba7d491fe64676224be00fab4`	pdf-javascript-stream	PDF /JS object 6 at offset 0x1AB	4991 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).

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