PDF malware analysis — malicious · 84154b112fc68b9c

MALICIOUS

PDF

76.2 KB

MD5: 78f7bd177e1df110f9d793c2a69a3672 SHA-1: 736073e3270c23feb989cb8f4cf90aa1c0b56723 SHA-256: 84154b112fc68b9c8485d07456d88f2d1b7ca17c255ecfe43f9b0e86f8778f9f

216 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains obfuscated JavaScript that utilizes a known vulnerability (CVE-2007-5659, Collab.collectEmailInfo) to execute a second-stage payload. The JavaScript is heavily obfuscated using binary XOR and String.fromCharCode, typical of exploit delivery mechanisms. The recovered JavaScript is a stager designed to download and execute further malicious content.

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` `2c1b2941c8bc426a36ed475eabe2bd532d9ade92164b79c003dfc61cd93a74a9`	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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