PDF malware analysis — malicious · d8dce46b34656e77

MALICIOUS

PDF

24.7 KB

MD5: de2331fa3b867e7287ad6de080ef0f78 SHA-1: 6708cdaad580b4620a183657518d6e8d1324d678 SHA-256: d8dce46b34656e77824cdd821ba8c2572bdfa457fd1cdca6762e909349ee11f3

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF file contains embedded JavaScript that utilizes eval() and unescape() functions, indicating an attempt to obfuscate malicious code. The critical CVE-2008-2992 heuristic firing confirms the exploitation of a known Adobe Reader vulnerability via util.printf. The deobfuscated JavaScript streams suggest the primary goal is to download and execute a secondary payload, though the exact nature of that payload could not be determined from the provided evidence. The ML classifier strongly supports the malicious classification.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

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
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 6

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111711_000.js` `f74a8cce87f96539a05a8c80eb738be99ead336dc95adeb826b514473fefe0d0`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3963 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 4 long base64-like blob(s).
`javascript_obj111712_001.js` `29a145141169a5f35e8c9d3452d17f593a8b8a21d85d0790b97fd90a8be19500`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x113F	15954 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 4 long base64-like blob(s).
`javascript_obj111713_002.js` `aeeeef71a6682bb775179188fa696a99466d1590302a2cdbe7d34709a2646bbd`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x4FC7	4737 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 4 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `fc73655a72de0e4f564fdd578cdc96b9d979fc030c2a4144bb166b740d0d419d`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x113F	1423 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `e282e90aa5eca950df2ca38b720cea9e6025f175e744e4f996f2c8820ba8b08c`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x4FC7	385 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_002.js` `fd56a589c9c86b34abcf37a2466cbb2800ccf6f6c4511b53e1a3842d3aecf280`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0x113F	1809 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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