PDF malware analysis — malicious · ce89db34efbd3042

MALICIOUS

PDF

21.3 KB

MD5: f8ffe56443c6bc257b111455a3537e23 SHA-1: 576370a511c1613eb01dfb309f9c357d1677e276 SHA-256: ce89db34efbd30426c9c5193cb56fc3486a550de6e9ab4781a99f109c8f268a5

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1071.001 Web Protocols

The PDF file contains embedded JavaScript that utilizes the `eval()` function and string concatenation to obfuscate its true purpose. The heuristics indicate exploitation of CVE-2007-5659 (Collab.collectEmailInfo), a known vulnerability in older Adobe Reader versions. The deobfuscated JavaScript likely downloads and executes a second-stage payload, as suggested by the 'legacy_pdfkit_stage' artifacts. The primary attack vector is the exploitation of this PDF vulnerability.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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` `8147649693f195705292dc0586f81d5e65e66cba2a33d649dd7241d52a1a3ca9`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3997 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` `0e1b6776721220a77f111812400435182552842e0dade6d3f31f0d4acd3b9b42`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x1161	15643 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` `1af8e85fba2954259b7f859608fcdbcdad0f79422a222d6ac015e104c2af3ef5`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x4EB2	1587 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` `3ce2f209b540fb36eed49cc31ae3f37f7cea4ebc079e3cbb3b999b83a97c1eae`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x1161	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` `36e8e7fbda7fe2c88ba1bcba44331704c78a29a684636c23a5e32b9bec90ed69`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x4EB2	86 bytes
`legacy_pdfkit_stage_002.js` `212779823e142698af4f4d917c9e206d0c4c0646e1107c4fc5dbbdb82386de3a`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0x1161	1556 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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