PDF malware analysis — malicious · b8fea87fe3353c5b

MALICIOUS

PDF

9.4 KB

MD5: 0b56db034094d9ce217e72d293821598 SHA-1: 86f1de7bc94f2f8d968ec25692c42611dbcd88ff SHA-256: b8fea87fe3353c5bf66d58391ca344168d71e132b89937a73c152b8a816cdcdd

178 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.001 Malicious Link/Object T1071.001 Web Protocols

The file is a PDF containing embedded JavaScript, identified by multiple heuristics including PDF_JAVASCRIPT and PDF_JS. The critical CVE_2007_5659 heuristic indicates the use of a known exploit targeting Adobe Reader's Collab.collectEmailInfo function. The embedded JavaScript, particularly the deobfuscated legacy_pdfkit_stage_000.js, likely facilitates the download and execution of a secondary payload, as suggested by the ClamAV detection of Pdf.Exploit.Agent-35905. The attack pattern involves luring the user into opening a malicious PDF that exploits a vulnerability to compromise the system.

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` `8ca1fc01fe61f2a4385bfbdede3487e8f5a319763e282281ddb309546ff912e7`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	11899 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` `2d5cd2334d771bb5b9f2d0a7a228569d7904bc591aac56b8915d3791fd1cfaa7`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	5047 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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