PDF malware analysis — malicious · 4b934c3b043cfe96

MALICIOUS

PDF

76.2 KB

MD5: 3c313dd138a83b4ee7522b09f4af7f4b SHA-1: 2501a711ac6aa5a5b1d3181913bad47daf0a45c4 SHA-256: 4b934c3b043cfe96510cbde39e55d0f5a3190e19401d5e4b3e2ad74e4fe8952a

216 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1071.001 Web Protocols

The PDF document contains embedded JavaScript that is obfuscated using binary XOR encoding. This script is designed to exploit CVE-2007-5659, a vulnerability in Adobe Reader's Collab.collectEmailInfo method. The script decodes and evaluates further JavaScript, which is likely responsible for downloading and executing a second-stage payload. The presence of the CVE-2007-5659 exploit and the obfuscated JavaScript stager strongly indicate a malicious intent to compromise the user's system.

Heuristics 7

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)
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.
Suspicious extracted artifact high 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.
String.fromCharCode medium PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically
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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0004_000.js` `a3e3b02faab366db01f316413a72b6db9029d311df65d19b97ac5f0c72614933`	pdf-javascript-stream	PDF /JS object 4 at offset 0xC0	77722 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` `9f2e93d9307bbfd4bba986d31eaac349e5fa7226a29722c25c7db7004b08045c`	deobfuscated-js	binary-XOR decoded JavaScript at offset 0x3D7	1273 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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