PDF malware analysis — malicious · b85f05ce1471aabb

MALICIOUS

PDF

9.2 KB

MD5: 4c9210f68294267ed61a0c1c96a4af42 SHA-1: 506b4873d122c41747517a7991740e30953c7608 SHA-256: b85f05ce1471aabb26e1409bf8ae06bed9f39f33f7df6b50b140339c43ac5764

178 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript that leverages the CVE-2007-5659 vulnerability (Collab.collectEmailInfo) to execute arbitrary code. The heuristics indicate that this JavaScript is obfuscated and likely attempts to download and execute a second-stage payload, as suggested by the ClamAV detection signature 'Pdf.Exploit.Agent-35905'. The extracted JavaScript streams further support this, with one being a deobfuscated version of the malicious script.

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` `5a9d370bdebbc0c7b7439d55cb844f473d32773a6fc71aa3f4f15d58bdbf6eef`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	11883 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` `7f6790b0c4c2d68d502cb1d9e6373c4a0a4f40a7e8bb3203116fae7bc78b88f0`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	4987 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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