PDF malware analysis — malicious · 3889f19b9ec7d7df

MALICIOUS

PDF

6.2 KB

MD5: 9c3749df0b3ac01fb2f50ca6db4f5d19 SHA-1: d18ceadb2818809d6ed91e40341be54169050f1f SHA-256: 3889f19b9ec7d7dfded0e64919af8f4f33a415d240f6fd16b66ba13b77dc33c9

178 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. A critical finding is the exploitation of CVE-2008-2992 via a util.printf call within a decompressed stream. This suggests the document is designed to exploit a known PDF reader vulnerability to execute arbitrary code. The presence of obfuscated JavaScript and a ClamAV detection for Heuristics.PDF.ObfuscatedNameObject further supports a malicious intent, likely to download and execute 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` `f9cdc8c18949aef6b17605de6957e8024f381b2067f5ec8fb5ef39ea8b460b10`	pdf-javascript-stream	PDF /JS object 6 at offset 0x19D	5146 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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