PDF malware analysis — malicious · b12da9bbc449376f

MALICIOUS

PDF

22.9 KB

MD5: 39da1bb861d72920a8a6bffedb65318b SHA-1: f5656a8edab60bc54320c2e61be9c915822844f3 SHA-256: b12da9bbc449376fb04fb421e11f23cd8355b9b160acbb30f05ed4b95e521351

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF sample contains embedded JavaScript that utilizes eval() and unescape() functions, indicative of obfuscation. The critical CVE-2007-5659 heuristic firing confirms the exploitation of a known vulnerability (Collab.collectEmailInfo) within Adobe Reader. The deobfuscated JavaScript stages suggest the primary intent 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` `f7492d58cad30f31d1d7ed8700495438eea05a764e622c70165b000c1432da6b`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3843 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` `5e4e2655a2b7b94111758510018778793287bf417ece1dedeeed5d1983834868`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x10C7	17497 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` `093812d3ae2b160931bc503ba3f6db78b8342b9f3e964ef03ff78bec28b4cb21`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x5556	1511 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` `e1ef57e355b39268ad264cc25028a9a0e38b4699b467c94913104d44e9e6dafc`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x10C7	1470 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` `66201566cb7b94b96d78c07e61c80e11578b5125ea85cc864e3cc788698af3dd`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x5556	79 bytes
`legacy_pdfkit_stage_002.js` `1395244c01d08e50ff89759a95cc372890850a63b5ec1b0dc2521a8b2b5a4098`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0x10C7	1550 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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