PDF malware analysis — malicious · 402e2646cbb16906

MALICIOUS

PDF

9.4 KB

MD5: a117d8bfaa837752a398c66a3e0fea3e SHA-1: 0ff7c12d74c1bdc83122ead9440b33dd8aa44793 SHA-256: 402e2646cbb16906958fd90f582474c88cfe104ecadb918e46630c2fdf40b9ad

178 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. Critical heuristics identify the use of CVE-2007-5659 (Collab.collectEmailInfo) and ClamAV detection as Pdf.Exploit.Agent-35905. The embedded JavaScript streams, particularly 'legacy_pdfkit_stage_000.js', are likely responsible for exploiting the PDF vulnerability and downloading a secondary payload. The deobfuscated nature of the JavaScript suggests it is designed to execute malicious code.

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` `892ce008c11021c711afbaf20f9114dab6818d1b2e63afd92acba7511d3c23b3`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	11960 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` `abde8b04afa52eaa053f3997a817dd95c4e8d969ac1b0c4d80667cc0e1bc067f`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	4999 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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