PDF malware analysis — malicious · 29c58ad9f141cc3d

MALICIOUS

PDF

8.7 KB

MD5: a85a5a9fdd21f14dfbb7b3d8e083c710 SHA-1: b8e7f86298ba9cff9ddc03896c54b32c53fff0fb SHA-256: 29c58ad9f141cc3d5db60078575896cbd5564a2085f78707d3f2e3c9ad9d85c1

108 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 PowerShell

The critical heuristic firing for CVE-2007-5659 indicates the PDF exploits a vulnerability using the Collab.collectEmailInfo function to execute JavaScript. Several JavaScript streams were extracted, with one deobfuscated stage (legacy_pdfkit_stage_000.js) containing code that appears to download and execute further content. The ML classifier also strongly flagged this PDF as malicious. The exact nature of the second-stage payload is not discernible from the provided evidence.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

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)
JavaScript action low 1 related finding 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_obj0001_000.js` `5a52b0f76ff642e38aa380e1c58dca23b58884b5a21ce6f39ee29ab218750f4e`	pdf-javascript-stream	PDF /JS object 1 at offset 0xF	54 bytes
`javascript_obj0013_001.js` `71837dabf6a87c6da4271f41578b96cee4cf2e2514226c09cc3344ab2136afd0`	pdf-javascript-stream	PDF /JS object 13 at offset 0x383	16890 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `60203df0abbd12519b2eef567bd6beae66dee27b82be25cc48a70cbe657da489`	deobfuscated-js	reverse-string concatenation decoded JavaScript at offset 0x383	561 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `4c4d5534b3e1c54c95f2d14aaf24c6100bea52a9ef73a7b2d915a04fa675a1d4`	deobfuscated-js	reverse-string concatenation decoded JavaScript at offset 0x383	566 bytes
`legacy_pdfkit_stage_002.js` `de9885a861cbf3096fb63ebdab5cb386461878e7f0a35572ef54b470dce86f2f`	deobfuscated-js	reverse-string concatenation decoded JavaScript at offset 0x383	565 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_003.js` `7a1829a9e6de472d0d1a3e27337764d00c953467ef4a743a7fd1f4ebbb480bea`	deobfuscated-js	reverse-string concatenation decoded JavaScript at offset 0x383	351 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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