PDF malware analysis — malicious · 4df669bd5ad81ad1

MALICIOUS

PDF

22.7 KB

MD5: d20bb08df11e78394e542b2e9aeb6739 SHA-1: 2eb58348a054d36565ec78c439642de963e01be7 SHA-256: 4df669bd5ad81ad143e667efacff69b856b06078ab76b4f521043af33805bf51

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF sample contains multiple embedded JavaScript streams, with one stream exhibiting high-confidence indicators of exploitation for CVE-2009-0927 via the Collab.getIcon method. The JavaScript is heavily obfuscated using string concatenation and eval/unescape functions, making static analysis challenging. The deobfuscated scripts suggest the primary intent is to download and execute a secondary payload. The presence of eval() calls and the exploitation of a known PDF vulnerability point towards a malicious document designed for initial payload delivery.

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 7

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111711_000.js` `923e549058c9ffd49133bb81639d00cecdf6db31e47d512a1c351cf3d0260930`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3036 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` `b0f37b6a5abb7ddd0c70a14b9939212c7e192439a906f17dd524aaaa8b7c6fac`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xDA0	17703 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` `81a88481af871221892b9a19731a3803eb09d2c09357d058e66ee6fe3c4a3756`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x52FD	1880 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` `da2068a71fc5644b488e7f250ece3c271e2d94c5bb10b8774a5ed64a624c1a25`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0xDA0	16933 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 12 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `42c6e0dfc1b4e08e336adc8028ccac82b04e3e6e9e4d4a4ebc532ab6cd132eec`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0xDA0	1520 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_002.js` `7eaea4809fae53ec0515341e8a7be53639e9cad19f795251137d107ca9e51ee1`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x52FD	104 bytes
`legacy_pdfkit_stage_003.js` `35b0bc10905556efabe89d0a85fa0ae226ee1d16d1e96fb29d4692177c024378`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xDA0	1625 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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