PDF malware analysis — malicious · 4b5faceadc254009

MALICIOUS

PDF

2.9 KB Created: 2008-02-06 15:29:31 +03:00 Authoring application: Adobe InDesign CS2 (4.0) (via Adobe PDF Library 7.0)

MD5: 3797d79c90ad4470717619d5c5ea2016 SHA-1: 823a9bc291af77d40c0a44c011cc517e787f2dc8 SHA-256: 4b5faceadc254009974d96698d7c603d0dfe06a1458931ec2be142b0109d5ae2

178 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript, triggered by an OpenAction, and utilizes unescape() for obfuscation. A critical heuristic identified the CVE-2008-2992 vulnerability, related to util.printf, indicating exploitation of Adobe Reader. The embedded JavaScript is likely designed to download and execute a second-stage payload.

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)
OpenAction trigger high PDF_OPENACTION

PDF has an /OpenAction — code runs automatically when opened
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
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_obj0013_001.js` `f570885139cd293c6140d5b4ab2cefda4c26d4315d2881e643ef5f6a81f42766`	pdf-javascript-stream	PDF /JS object 13 at offset 0x36C	4243 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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