PDF malware analysis — malicious · c760a5ac7338d2ea

MALICIOUS

PDF

7.9 KB

MD5: 9bd5cd6f82b44d4e4b552313c9874967 SHA-1: 03385ddbeff8ee83112e83f630cd1f3dc2f0ef64 SHA-256: c760a5ac7338d2ea853035e182535e4bb4386144ff47a93e9ca6f03f048d8483

108 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF sample contains embedded JavaScript, flagged by multiple heuristics including a critical CVE-2008-2992 trigger. The ML classifier strongly indicates maliciousness. The embedded JavaScript, particularly the deobfuscated 'legacy_pdfkit_stage_000.js', appears to be responsible for downloading and executing a second-stage payload, as indicated by the 'ML_NYX_PDF_MALICIOUS' heuristic and the presence of obfuscated JavaScript streams. The specific exploit used is CVE-2008-2992, which involves the util.printf function.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

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)
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_obj0001_000.js` `6e2d32ebaa3496a95868e5acc413df9413218a2c8af5f1954aa1d2dc0c8be58d`	pdf-javascript-stream	PDF /JS object 1 at offset 0xF	67 bytes
`javascript_obj0013_001.js` `628b4cc2c9e5b06c7ba46692411e4f6d2d565a7421d68cedcc14e985d9a66c81`	pdf-javascript-stream	PDF /JS object 13 at offset 0x39D	17719 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `a8347ba9e03cad50e2267acd4e4a8317a67af706aa4d79945eee00c3837ce311`	deobfuscated-js	reverse-string concatenation decoded JavaScript at offset 0x39D	2102 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).

Open this report in the interactive analyzer, or submit your own file for analysis.