PDF malware analysis — malicious · cafcea423d6c78ee

MALICIOUS

PDF

76.5 KB

MD5: 18674b612f851d0ef8654cb00782152c SHA-1: 4ecb622b2292f7e7e519c940ca7012f74e7f21f6 SHA-256: cafcea423d6c78ee9defe5fe57f6919f4ce59b7a7eeffac0bd6f1f7da697112f

226 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.001 Malicious Link T1204.002 Malicious File

The PDF file contains embedded JavaScript that utilizes a binary XOR stager to decode and execute a second-stage payload. The critical heuristic 'CVE_2007_5659' specifically identifies the use of 'Collab.collectEmailInfo' to launch an Adobe Reader exploit. The ClamAV detection 'Pdf.Dropper.Agent-7304124-0' further confirms its malicious nature as a dropper. The JavaScript stager is designed to download and execute a further payload, indicated by the XOR decoding and eval() calls.

Heuristics 8

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.Dropper.Agent-7304124-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7304124-0
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
Binary-XOR JavaScript stager high PDF_BINARY_XOR_JS_STAGER

PDF JavaScript stores viewer-version payload branches as long binary digit strings, XORs each bit pair, converts 8-bit chunks with String.fromCharCode, and evals the recovered exploit stage.
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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape 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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0004_000.js` `3d5a3b9371015a399d3f01a00fc9fd7039d1340d7481341c4848813756abd26a`	pdf-javascript-stream	PDF /JS object 4 at offset 0xC0	78010 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 6 long base64-like blob(s).
`binary_xor_stage_000.js` `3a101db128e1a72ff9550f3f627082bde6f706f37816a8d779cee4047e54d8d7`	deobfuscated-js	binary-XOR decoded JavaScript at offset 0x3D7	1279 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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