PDF malware analysis — malicious · c28e54b2f04ff0bd

MALICIOUS

PDF

20.7 KB

MD5: 8f14a0395fa2524722e08b938a52d92d SHA-1: 42e1ec07b488e0f129a5547e9150cc041141aab6 SHA-256: c28e54b2f04ff0bd49969e18d1618814d3c6c5ee5627521ab3c48d2e590e1635

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1204.002 Malicious File

The PDF file contains embedded JavaScript that utilizes eval() and unescape() functions, indicating obfuscated code execution. The critical heuristic firing for CVE-2009-0927 (Collab.getIcon) confirms the exploitation of a known Adobe Reader vulnerability. The deobfuscated JavaScript stages suggest the primary intent is to download and execute a secondary payload, characteristic of a downloader or initial access exploit.

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` `28085e5ea90df836f6087abd65a32b2e2b5acfc86c41d1e0b13e97f04f31f8cd`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3264 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` `764094a933c15ea8deabaeed4ef18892fb33e06840d5c8e841652e59e68a5d0d`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xE84	15597 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_obj111713_002.js` `81a651249d2671c8bbe4346e74cb53fcc4401e877861e8e5675d6a4764651924`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x4BA7	1701 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).
`legacy_pdfkit_stage_000.js` `7f9a4ef8110bfefdcfe45f596b35e9897876bec8eee9f4472e86eb7ba89a591b`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0xE84	1522 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 0x4BA7	99 bytes
`legacy_pdfkit_stage_002.js` `569bbcefdafe58ea2f73e32884081fb9d1fac57968818524985b06d58aa18c2e`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xE84	1622 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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