PDF malware analysis — malicious · 4bddef9bdd63bcd1

MALICIOUS

PDF

13.3 KB

MD5: 1eb09e4e3f6384e99c25d3dfeefe77d6 SHA-1: bb04d59bf44d23a25d2702d51b772a042455adf5 SHA-256: 4bddef9bdd63bcd1e96ed592231fd104831a4d0389c95635dcb77068879faf96

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1071.001 Web Protocols T1204.002 Malicious File

The PDF file contains a critical heuristic firing for CVE-2007-5659, indicating it exploits a vulnerability in Adobe Reader. Further analysis reveals a binary-XOR JavaScript stager that decodes and executes embedded JavaScript. This stager is responsible for downloading and executing a second-stage payload, as indicated by the 'Pdf.Dropper.Agent-7212212-0' ClamAV detection.

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)
ClamAV: Pdf.Dropper.Agent-7212212-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7212212-0
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. (matched inside decoded stream)
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_obj0049_000.js` `b8c72e2b76b4c1559748c919b85dc09883ef31a1c7d1d9e58abda9995dc54230`	pdf-javascript-stream	PDF /JS object 49 at offset 0xA	79132 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 6 long base64-like blob(s).
`binary_xor_stage_000.js` `6bdc047e91da9710d2e9b666e6bb7512fe763f27be98afaed1831303ac5c2c84`	deobfuscated-js	binary-XOR decoded JavaScript at offset 0x3F8	1324 bytes

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