PDF malware analysis — malicious · ff3f3c714b7c2c0c

MALICIOUS

PDF

8.7 KB

MD5: 29c56196e51b6137f6e9e8c819206bd7 SHA-1: ef9af584e0bc0d673546d385435b909689d25e34 SHA-256: ff3f3c714b7c2c0ceaf08fc1165179b7dd686806917611aff611ad9e065f82b2

110 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The critical CVE-2007-5659 heuristic indicates the PDF exploits a vulnerability via the Collab.collectEmailInfo method to execute JavaScript. Several JavaScript streams were extracted, with one being particularly large (16890 bytes), suggesting it contains the main payload. The ML classifier strongly flagged this PDF as malicious. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload, as is common with this type of exploit.

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 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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