PDF malware analysis — malicious · efd8a040eb5132a2

MALICIOUS

PDF

5.8 KB

MD5: f55808630b5641de9ba016a265ada1c3 SHA-1: 3ad871b51fe164434c5cb3a201bd7c9aaf4ef935 SHA-256: efd8a040eb5132a2047db92ce956984369c4091e8b391f6971f55457aaf59afd

178 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. A critical heuristic identified the CVE-2008-2992 exploit (util.printf), suggesting the JavaScript is designed to leverage this vulnerability. The ClamAV detection further confirms its malicious nature. The embedded JavaScript is likely responsible for downloading and executing a secondary payload, as suggested by the extracted artifact 'javascript_obj0006_000.js'.

Heuristics 6

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)
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` `1f65f02054c11f55075fc3fdd1bccdc080dff12e4f16852470478152e979de39`	pdf-javascript-stream	PDF /JS object 6 at offset 0x19F	4957 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).

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