PDF malware analysis — malicious · 971f94d9649603a9

MALICIOUS

PDF

6.7 KB

MD5: cdea75ccd5c2b079ed8b61044c25a07c SHA-1: 43e493f19a2b1006fa0f515502ac928056c7dacd SHA-256: 971f94d9649603a9d1be7275e1dc3d5df18fb83ccf80248350be34edfffe3f7e

178 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The critical CVE_2008_2992 heuristic firing suggests the exploitation of a known vulnerability within the PDF viewer to execute this script. The script is obfuscated, as noted by PDF_UNESCAPE and CLAMAV_DETECTION, and its purpose is likely to download and execute a second-stage payload. The extracted JavaScript file, javascript_obj0006_000.js, is a strong indicator of this malicious activity.

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` `b937a0478de1775226934226cc619809195e51d3e54b3524a55a65e786b5f16e`	pdf-javascript-stream	PDF /JS object 6 at offset 0x197	5610 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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