PDF malware analysis — malicious · d75e9e9f391e9a1b

MALICIOUS

PDF

9.2 KB

MD5: 77346d4515b132b66100526e3d422c13 SHA-1: 443a1a955ddb159830be5c77222c6b10a58f1483 SHA-256: d75e9e9f391e9a1bfcd7137e3ecdca993013a5da5ffdf2b83fd36108ae04a1e2

208 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The file is a PDF that leverages the CVE-2007-5659 vulnerability, indicated by the 'Collab.collectEmailInfo' heuristic firing. This vulnerability allows for the execution of embedded JavaScript. The analysis indicates that this JavaScript is designed to download and execute a second-stage payload, as suggested by the 'ML_NYX_PDF_MALICIOUS' and 'ClamAV: Pdf.Exploit.Agent-35905' detections. The presence of multiple JavaScript streams and deobfuscated JS files further supports this attack vector.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

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)
ClamAV: Pdf.Exploit.Agent-35905 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35905
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `d8a6b4ad1abf04d0c4a4f89535cfb57f7312edef25c443f4e844c8ec9d0929dd`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19B	352 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `e0094551b531755851fdabaebf6451c1992a9ac1c9a51f2ed931457ec30a56ae`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	11636 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `16bb928acdb342727f1f8993b7da565ec2134f17bbbe29e8e22f0b8bee9ac7af`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	4859 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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