PDF malware analysis — malicious · d83a4d8b0bfc500d

MALICIOUS

PDF

9.1 KB

MD5: 860c8b2f6c6e4a60df2f9872d494f1ff SHA-1: e637eb50c9fec73ffaf381dc705a93950a694898 SHA-256: d83a4d8b0bfc500d4f0df411a1a21f0828c9df2b76d7cf007e5600153b96d9a8

178 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript that is heavily obfuscated and utilizes the unescape() function, indicating an attempt to hide malicious code. The critical heuristic firing for CVE-2007-5659, specifically related to Collab.collectEmailInfo, strongly suggests exploitation of this known PDF vulnerability. The ClamAV detection further confirms the malicious nature of the file. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload.

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` `848b7a15f3f00c8b2ae9b4e3a2a994565bb78e824ffd6c685f5df9cd0cc2d8bb`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	11605 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` `60eb06d746cb3e009aece4c8c790563b43975b18ad2faf25953c27192d06e6d4`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	4850 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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