PDF malware analysis — malicious · 3d196e92846f7bd3

MALICIOUS

PDF

23.0 KB

MD5: c9ade4a983ee28cdfc61d157254c604c SHA-1: 3e9530bf06c39695f71b2517ef267d4c83a90a17 SHA-256: 3d196e92846f7bd3ed17de6123bf8d5a90c17bc42ba772d3c9aa4ad83454bbd9

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 an attempt to obfuscate malicious code. The critical heuristic firing for CVE-2009-0927, specifically mentioning Collab.getIcon and a multi-marker percent-array encoded JavaScript, strongly suggests exploitation of this known vulnerability. The script's primary function appears to be downloading and executing a second-stage payload, which is a common technique for delivering further malware.

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` `c3b29e4b3b20da247cd4b7a9a21396afd7e83dca77e513548844981010cdfee8`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3325 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` `d77f68e2bf9757c8a381c0a3d391683a75b4c615f60b2132234a953ad831daf7`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xEC1	17976 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` `1045f2d6eb910897808c24a8ff536e2af3eb9314a02a8aebc66689116dec896e`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x552F	1634 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` `a7bf9e8f3472d8e456111af54d3cbfd9bd06c7e59489254ed4481e1c4d057ace`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0xEC1	1520 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` `d8bb01cdd5388899d305000331f6161bd7ddfc865c9040ac12fb0f85f79863df`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x552F	105 bytes
`legacy_pdfkit_stage_002.js` `1a1a0f39f38b1afc10e804214362a6e665b9098c6943f50ffbf60dfd4c79f207`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xEC1	1626 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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