PDF malware analysis — malicious · 6fea74596a08a0b1

MALICIOUS

PDF

7.8 KB

MD5: fc280c488d674f91025c01472be43e79 SHA-1: 5a7dffffeccf9818084df55adf49da1986d6ce03 SHA-256: 6fea74596a08a0b1c4854956963e898390e716cd44f19429b7253e6681a91208

108 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document contains embedded JavaScript that is obfuscated and uses a string-reversal technique to decode its payload. Static analysis identified the CVE-2008-2992 exploit trigger, indicating the sample is designed to execute arbitrary code. The deobfuscated JavaScript appears to download and execute a second-stage payload, as evidenced by the structure and content of the 'legacy_pdfkit_stage_000.js' file.

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` `581439d46956c56feaae901272b63d791a55b700dece5ff29c6717bc8794f1dd`	pdf-javascript-stream	PDF /JS object 1 at offset 0xF	53 bytes
`javascript_obj0013_001.js` `75f4bf275543985077756dc3e97b5154d2257da7db08c1152b5204f85d8fc4df`	pdf-javascript-stream	PDF /JS object 13 at offset 0x381	16311 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `71aff3d3b99e74cf46da588d9da0694643c4933be336f3a730f7bae0af782f27`	deobfuscated-js	reverse-string concatenation decoded JavaScript at offset 0x381	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).

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