PDF malware analysis — malicious · 54b561df5c3e6ef1

MALICIOUS

PDF

4.1 KB

MD5: 257b6dfecde62867848f0216f034f6ac SHA-1: dc0d16273122ac54fbe536304f849752fb6b186e SHA-256: 54b561df5c3e6ef1a2a48fa5443bd266451a18633fc81f428666981d3c8cfabb

158 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF sample contains multiple layers of obfuscated JavaScript, including calls to eval() and String.fromCharCode(), indicative of exploit code. The critical CVE-2008-2992 heuristic firing confirms the use of util.printf to leverage this specific Adobe Reader vulnerability. The embedded JavaScript is designed to decode and execute a second-stage payload, likely leading to further compromise.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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. (identified after JavaScript deobfuscation)
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` `18b00af1d592cc3cd181bc56f3224085165d2f1f3fcedcec5b510e36b0cdf490`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6401 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` `55a2aab041e156c43a3e8bda0aff5a814450e725cbe2bad9ecd0b1f1dd59e5ad`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3647 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` `0685bfe5f49b43e9e175129ab95d5cfa22289cab621dc47da3bb43d893f8c9d7`	deobfuscated-js	custom Base64 decoded JavaScript layer 2 (PDF /JS object 13) at offset 0x95E	2043 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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