PDF malware analysis — malicious · 0b9f16dcde40369e

MALICIOUS

PDF

1.5 KB

MD5: 9179cbf4f3052b9ef20f0fbcc4e5f1e4 SHA-1: a730c878baa3cedb232c795effe819865cfff15c SHA-256: 0b9f16dcde40369eb863b0a35db0fb4fda40226c6b0bb684cbc2d5cea38c052f

268 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript that leverages the CVE-2008-2992 vulnerability (util.printf) to achieve code execution. The deobfuscated JavaScript indicates it attempts to download and execute a second-stage payload from a hardcoded URL. The ClamAV detection 'Pdf.Dropper.Agent-7227516-0' further supports its role as a dropper.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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)
PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
ClamAV: Pdf.Dropper.Agent-7227516-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7227516-0
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111111_000.js` `1d699457a5c179865a48d18d6876a21ef4c38797b6424846003922bbdba34864`	pdf-javascript-stream	PDF /JS object 111111 at offset 0x160	2479 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`javascript_obj111112_001.js` `259183b5bfe43ced8f74e766f3e1b2fad66157475e0d9841b42cd56543dc5910`	pdf-javascript-stream	PDF /JS object 111112 at offset 0x5A2	32 bytes
`combined_document_js_000.js` `27ed9ef35e9b84f9f260bf9aec19bb67af88e9977448ac0b949da7912fe4cd4f`	deobfuscated-js	combined document JavaScript streams at offset 0x160	2512 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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