PDF malware analysis — malicious · 2cbf2be9e60b8c74

MALICIOUS

PDF

18.5 KB

MD5: 31942c3b7ebcbe994900a57d4311f9f5 SHA-1: fe2577fc0ee3caacf6ca4bad6d8e4e4ab78f749b SHA-256: 2cbf2be9e60b8c74c420a1b36c37f10cb98aafec92d51acc624a345a5eacc268

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/Shell T1204.002 Malicious Link/URL

The PDF file contains embedded JavaScript that utilizes eval() and unescape() functions, indicating an attempt to execute arbitrary code. The critical CVE-2009-0927 heuristic firing confirms the exploitation of a known Adobe Reader vulnerability via the Collab.getIcon method. The JavaScript appears to be heavily obfuscated, likely to download and execute a second-stage payload. The reconstructed string literals from the DOC BODY, such as 'eval', 'unescape', and 'String', are core components of the obfuscation and execution mechanism.

Heuristics 5

Collab.getIcon — CVE-2009-0927 critical CVE exact CVE_2009_0927

PDF JavaScript calls Collab.getIcon — CVE-2009-0927 is a stack buffer overflow in Adobe Reader triggered by Collab.getIcon() with a crafted argument. Allows arbitrary code execution. (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` `7ee90506192784e11c09e02eac713bbe08889e7dd4c7e3560377e35322342a3e`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3351 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s).
`javascript_obj111712_001.js` `5192cd5adaa1a4d05447adbfd3b14f25c4dc7dcf1e1d7a9b39247a557e0d6ba9`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xEDB	13265 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` `f55cd87812c0d3986d1a8a40714f26656b786f0cd4bbd475c93c4f5dd06351f4`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x42E2	1726 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` `1412a09b263e0a64c28cc7f184247102cbe88e4b5ed6b84ed0c0c83087aaa08b`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0xEDB	1521 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` `1397a77c63e5e8be02a059fd3c671fb708b92cb64d00ded4f2045e71093dec16`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x42E2	99 bytes
`legacy_pdfkit_stage_002.js` `304d67ac207b77af4308fc097efd95ccd42eb93a9afaa0a93566636fc003e284`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xEDB	1621 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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