PDF malware analysis — malicious · d4cf1d8661d631ee

MALICIOUS

PDF

20.0 KB

MD5: 77b637c780730a9e36492c52a712ba62 SHA-1: f0a22be27e55c9a334c6b164fc817017c8933015 SHA-256: d4cf1d8661d631eeb4d44703c57cf411edcc29d8d1c936cbccf8074073c65db8

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript that utilizes eval() and unescape() functions, indicating obfuscation. The critical heuristic firing for CVE-2009-4324 (media.newPlayer) confirms the exploitation of a known vulnerability in older Adobe Reader versions. The JavaScript is designed to download and execute a second-stage payload, as evidenced by the deobfuscated scripts and the heuristic firings related to JavaScript execution and obfuscation. The reconstructed string literals within the JavaScript, such as 'v'+'ar '+'Ivtm7A4jw6hm'+' ='+' e'+'v'+'a'+'l', point to the use of JavaScript for malicious execution.

Heuristics 5

media.newPlayer — CVE-2009-4324 critical CVE exact CVE_2009_4324

PDF JavaScript calls media.newPlayer — CVE-2009-4324 is a use-after-free in Adobe Reader's multimedia plugin triggered by media.newPlayer(). Actively exploited as a zero-day in December 2009. (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` `9dc856ddfc0f03006e6e232e1ec7537040240617d28c4c60d7c03d4a249101a7`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3192 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 6 long base64-like blob(s).
`javascript_obj111712_001.js` `7130887234e4617c43fe130a93ab4877e8cc4c33ad39d4535be073bc8b513bf1`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xE3C	14041 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 6 long base64-like blob(s).
`javascript_obj111713_002.js` `1c60d4a77936d01630e2df0731586afd08636f384bdbaa91304756d1095bc958`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x454B	2606 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 6 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `14d9d23d619682a659b666d1537fbe47a8cc4db49b0c37d63714847d39b24a42`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0xE3C	1080 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `5091795dc7dfd1e269d30a5ab394f1536cab6157b0cb74b7e26a9fdc9129a46f`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x454B	165 bytes
`legacy_pdfkit_stage_002.js` `376cfd6a3f51ed54b8d4ce85d16c3e84d41b9f4c131e27b4ab8715d3f12255e2`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xE3C	1246 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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