PDF malware analysis — malicious · 19e0ab7690f964eb

MALICIOUS

PDF

8.3 KB

MD5: c12ef2d67b66440a78c494e80e268b8f SHA-1: 352c5bb79658482e3ed460a33cfc94e91762d3c4 SHA-256: 19e0ab7690f964ebbee814a1d1d512049c0cf79df260e2de650f2bd9a543ccc7

110 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, triggered by the CVE-2008-2992 vulnerability via `util.printf`. The JavaScript is heavily obfuscated but appears to be designed to download and execute a second-stage payload. The ML classifier strongly indicates maliciousness. Due to the obfuscation and lack of specific indicators for a known family, the family is classified as unknown.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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)
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.
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
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_obj0001_000.js` `10f17ebafd50710f4f636ff5d3ddb1df619e26fb03a38f559cab85073c40f2d8`	pdf-javascript-stream	PDF /JS object 1 at offset 0xF	43 bytes
`javascript_obj0013_001.js` `c1248ab8a845c45391f419a30ee4e13344f04d50f05ca7523ab8f7fafa305a47`	pdf-javascript-stream	PDF /JS object 13 at offset 0x36D	19249 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `f2b6a088fee4c3032fe89586c385b0780fec9b97545481a937ae14d511242b8e`	deobfuscated-js	reverse-string concatenation decoded JavaScript at offset 0x36D	598 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `949d62f29d67bec922a3ccc0aae848ad7c731ea7e12228f17df54d15f531622d`	deobfuscated-js	reverse-string concatenation decoded JavaScript at offset 0x36D	611 bytes
`legacy_pdfkit_stage_002.js` `7097e9de7f2988fa83fc3b3a990cb89c6d87f6ffd14428a2d5fdfb1bf34c9b40`	deobfuscated-js	reverse-string concatenation decoded JavaScript at offset 0x36D	614 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_003.js` `f5a75d1e97fec3e80fad5ef9e32822470f77dff0f8999e849ef6258b5da36db1`	deobfuscated-js	reverse-string concatenation decoded JavaScript at offset 0x36D	279 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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