PDF malware analysis — malicious · 3469459c7f41f108

MALICIOUS

PDF

19.3 KB

MD5: 22748feeace569530ed7fe9c5255680d SHA-1: 9bebd91c3a308fe35248606fde107a3c91f48822 SHA-256: 3469459c7f41f108c0543bedf642a843b8724955094a43d3d2b00cd9b8b790c7

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF sample contains embedded JavaScript that utilizes the eval() function and string concatenation to obfuscate its actions. The critical heuristic firing for CVE-2007-5659 indicates the exploitation of a known vulnerability in Adobe Reader via the Collab.collectEmailInfo function. The deobfuscated JavaScript streams suggest the script's purpose is to download and execute a secondary payload, a common technique for initial access.

Heuristics 5

Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659

PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (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` `f532d0c2f9acc88100a0e7c32bfb938322409ea9496cea4d54f92851af288b9c`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3554 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` `26b81464b7299295af8f3d2bf753537063c315f2d2709acedc387a6fcdc6d8e1`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xFA6	14241 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` `cf4c42c35a8a2db5c0a8149103d5d19eb9478f0472c5533f5a1e03214a500afc`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x477D	1346 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` `3ce2f209b540fb36eed49cc31ae3f37f7cea4ebc079e3cbb3b999b83a97c1eae`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0xFA6	1469 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` `45f33a2b6011dbedaffbca7d7ed47c6f494a02676d7ebb603cee90d70a37c9b2`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x477D	79 bytes
`legacy_pdfkit_stage_002.js` `13af008d853c9c689fce6ca085976c9476103b7a7fd2c248a4c19bf629928a89`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xFA6	1549 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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