PDF malware analysis — malicious · 99730bbe4d6afc5c

MALICIOUS

PDF

9.3 KB

MD5: 093715a072ae85ad0920ff6d76e0119b SHA-1: 28485b52817f84f6e27ce993bb9ae454422735f3 SHA-256: 99730bbe4d6afc5cc29addae5fb31266b13f72039fd3562f72e98a4f6de8182f

178 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The critical heuristic CVE_2007_5659 indicates exploitation of a known PDF vulnerability using JavaScript. The embedded JavaScript streams, particularly the large deobfuscated ones, suggest complex malicious code execution. The ClamAV detection further confirms its malicious nature. The primary attack vector appears to be leveraging the Collab.collectEmailInfo method to execute arbitrary JavaScript, which is then likely used to download and execute further stages.

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` `5c31793df87a12d523229cc2b91967d7c92d751b8ecb1017418c98896da18675`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	11891 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` `60312d925651df6eaf94d2c31f62ea3b326affa39588b14d33dbf2b3cd8081fa`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	5001 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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