PDF malware analysis — malicious · 1b5d60f5e04b1be8

MALICIOUS

PDF

6.1 KB

MD5: b26047bcbd08cce648001fc0fa668dd5 SHA-1: c937048ce14e182573aa2de249f225b52e3da3e9 SHA-256: 1b5d60f5e04b1be869237b4eeb75c07ddfc01135914036a36764c61a94bfac2a

178 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/Shell Script Execution: JavaScript T1204.002 Malicious File: User Execution: Malicious JavaScript

The PDF file contains embedded JavaScript, which is obfuscated and utilizes the unescape() function. A critical heuristic identified the CVE-2008-2992 vulnerability (util.printf), indicating an attempt to exploit this known PDF flaw. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload.

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` `f553d72979430ca481929fdf8e99aca22faa9da60cd4fc040adc8eb25c2f60b6`	pdf-javascript-stream	PDF /JS object 6 at offset 0x1A3	5278 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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