PDF malware analysis — malicious · 8ce0b5b0781fae20

MALICIOUS

PDF

4.1 KB

MD5: 385fd4a5b2b18d5648477db35ca324a4 SHA-1: c07ddbd11ab02d1eb6dbbe52a018686ffca78751 SHA-256: 8ce0b5b0781fae2097a2631ecd88c4229bdb73487cdc0de4a44cef1a503b8579

216 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 PowerShell T1059.003 Windows Command Shell

The PDF file contains embedded JavaScript that utilizes the 'eval()' function and 'String.fromCharCode()' in conjunction with a custom Base64 decoder. This indicates an attempt to obfuscate and execute malicious code, specifically targeting CVE-2008-2992 in Adobe Reader. The ML classifier and ClamAV detection strongly support this assessment, classifying it 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. (identified after JavaScript deobfuscation)
ClamAV: Pdf.Dropper.Agent-7685800-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7685800-0
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
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_obj0013_001.js` `0fb029746d1f0c71921e0a2119ffb0d1da2723e4509e7008c45999fedc378a41`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6393 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).
`acroform_b64_00.js` `25e9792d495e6cd65b928ccecd9a395d43f8e63cac58f027897732a0bdd095e6`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3642 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`custom_b64_stage_000.js` `85fe71200c33f398824631ccde606ec4fbbce8035fb8611c145accabab2137e1`	deobfuscated-js	custom Base64 decoded JavaScript layer 2 (PDF /JS object 13) at offset 0x95E	2025 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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