PDF malware analysis — malicious · f36b7e5b55cacf84

MALICIOUS

PDF

9.3 KB

MD5: 261c6365cd21984088560af0c4fa990e SHA-1: 22fa64510ae3efd63bd39748e810f8c21b65312c SHA-256: f36b7e5b55cacf8422d1e53c4c5dbd82c49f956304b2361036dcd5f82c3df381

180 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious File T1059.003 Windows Command Shell

The file is a PDF containing embedded JavaScript, which is flagged as malicious by ClamAV (Pdf.Exploit.Agent-35905). Critical heuristics indicate the use of CVE-2007-5659, specifically the Collab.collectEmailInfo method, to execute JavaScript. This JavaScript is likely designed to download and execute a second-stage payload, as suggested by the deobfuscated JavaScript streams.

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` `c01543f7be823740f396a9394e21ce21bca56443802c3c4b34ef67bf7c992af9`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	11775 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` `a6c268f6ac7d40a6a56cf14f90f50e0ae7e31d9475991cc795a9fc9b352959ea`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	4915 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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