PDF malware analysis — malicious · 77307f6e93f73d6a

MALICIOUS

PDF

9.3 KB

MD5: 68d8cb5ad259da0ab0a82de3759e3f4a SHA-1: 1d59729062b3c05c093f923ef24a1eb5df310783 SHA-256: 77307f6e93f73d6a3b733fa7e2ca8eb7a49abece5f41b329c51512dc66b72f42

178 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, which is triggered by the 'Collab.collectEmailInfo' method, exploiting CVE-2007-5659. The JavaScript is heavily obfuscated but appears to be designed to download and execute a second-stage payload. The ClamAV detection 'Pdf.Exploit.Agent-35905' further confirms its malicious nature. The document body is unreadable, so the rationale is based on the script and exploit findings.

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` `efd4c1f3138c508b7603aa58637049ab93296ad86a5b1e1679f6cc0496cd6cac`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	11800 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` `28354a316ead17885e40a3b8013980ae2fa60c916ccf3f2c66aadfe5c0ac67cb`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	4969 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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