PDF malware analysis — malicious · 45b7b1b5cfac3b47

MALICIOUS

PDF

9.1 KB

MD5: 44364b3b2b6d98848588922fa1f6b0cf SHA-1: 55bb66d6d0a9a1f958bb415abe8bde7cbebad77b SHA-256: 45b7b1b5cfac3b47f5ce38bc07333fda2edcf3524bbd9225c550ff5037046526

178 Risk Score

Malware Insights

MITRE ATT&CK

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

The file is a PDF containing embedded JavaScript, identified as malicious by ClamAV (Pdf.Exploit.Agent-35905). The critical heuristic CVE_2007_5659 indicates the use of the Collab.collectEmailInfo method, a known exploit vector for PDF readers. The JavaScript is heavily obfuscated, but the exploit mechanism suggests it is designed to download and execute a secondary payload. No specific family could be identified.

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` `b52cdca3a2e9f8a1c7a48c02c4d50b787bc425d9215eb872f89b90fe0f25b6b7`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	11661 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` `5d3a6e7499eb505a7c09e7265f53220c38324b97ecbf4fa3d7d579a277638f60`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	4820 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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