PDF malware analysis — malicious · cfa4b2ba3aea9b16

MALICIOUS

PDF

9.3 KB

MD5: 2f8aa0e445ce2eb86af5aa85640e5094 SHA-1: f02d1835ba23aba304445b6e83cf6a39b763b54e SHA-256: cfa4b2ba3aea9b16786113a348df0fe3dca1db00f79e6ec182f40d30b70c2ef0

180 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link or Macro: User Execution: Malicious Link T1204.002 Malicious Link or Macro: User Execution: Malicious Macro

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The critical CVE_2007_5659 firing specifically points to the exploitation of a known vulnerability (Collab.collectEmailInfo) to execute JavaScript. This JavaScript is likely used to download and execute a second-stage payload, as suggested by the ClamAV detection of Pdf.Exploit.Agent-35905 and the presence of deobfuscated JavaScript streams. The document body was unreadable, but the technical indicators strongly suggest an exploit delivery mechanism.

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` `9f5182f89d3b14a66b7c15d05b353afdaab0b27f6af2d35e39e2faae71439c24`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	12028 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` `031cec3d5c2cd20ff3a9f65e5f87b0cbd242c47e6dc2bba703c7204365dd5603`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	5000 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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