PDF malware analysis — malicious · 96f177459d3e25a6

MALICIOUS

PDF

4.1 KB

MD5: 36acada715d72d4934ab2257fba495e8 SHA-1: 2f96c96f0d47420da5212a8a5f61b081623f80bd SHA-256: 96f177459d3e25a6acf999b7a0ff44d5e8af4a65b3e47c23c5e80109e5396818

216 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains embedded JavaScript that utilizes eval() and String.fromCharCode, indicating obfuscated code execution. The critical CVE-2008_2992 heuristic firing confirms the presence of an Adobe Reader exploit targeting util.printf. This exploit likely downloads and executes a second-stage payload, as suggested by the deobfuscated JavaScript artifacts. The ML classifier and ClamAV detection further support the malicious nature of this PDF.

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-1828857 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-1828857
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` `199c5e861cc4c52cc7ae9d64eaae871238e7a58300df078af326a03d86d065ea`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6425 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` `f90df8a021d5b8ab57d95d9aadbdde29d75944c5f7de64ffcdef66b34cca9841`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3664 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(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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