PDF malware analysis — malicious · 19d482e02c3c7fcb

MALICIOUS

PDF

74.5 KB

MD5: 01c783bab55f8daec4e582f6d3083713 SHA-1: 9eea5d37dae1511aa301c6183d20780f8448b4fb SHA-256: 19d482e02c3c7fcbd8bdb170756c255051ec1c7b2df24b66a6b2f32ae707a703

226 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains obfuscated JavaScript that utilizes the `Collab.collectEmailInfo` method, indicative of the CVE-2007-5659 exploit. The script is further obfuscated using binary XOR and `String.fromCharCode`, suggesting it acts as a stager to download and execute a secondary payload. The ClamAV detection `Pdf.Dropper.Agent-7234717-0` confirms its malicious nature as a dropper.

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-7234717-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7234717-0
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` `9f1335753ef0452678eda9165827ab98d063f1cb71f39bad92dc670735c1dd67`	pdf-javascript-stream	PDF /JS object 4 at offset 0xC0	75994 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` `e643e0f9502d0212754b802b9ded5ce24512343e096cb65550d74ca84bf89705`	deobfuscated-js	binary-XOR decoded JavaScript at offset 0x3D7	1237 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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