PDF malware analysis — malicious · 1da8c46d1313d44b

MALICIOUS

PDF

2.8 KB

MD5: 3e97d0872ae4ac19792317437959f68d SHA-1: 47f39342e0efa9798aa4cc28da2841a368ef5bc8 SHA-256: 1da8c46d1313d44b714109e81372f62b727dad8e76933dd073c1e44c37606cfa

216 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: Malicious JavaScript T1071.001 Web Protocols: Web Protocols

The PDF file contains embedded JavaScript that utilizes the unescape function and a printf call indicative of CVE-2008-2992. Static analysis of an extracted JavaScript artifact (javascript_obj0003_000.js) and ClamAV detection (Win.Trojan.Agent-36168) suggest this script is designed to download and execute a secondary payload. The overall attack pattern is consistent with a malicious PDF dropper.

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 detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
Suspicious extracted artifact high 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.
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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0003_000.js` `265368e565c8074395830516c6d1273fbb5f3ec287fa3fb56c97b54a8bf83d88`	pdf-javascript-stream	PDF /JS object 3 at offset 0x25D	1906 bytes
Detection ClamAV: Win.Trojan.Agent-36168 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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