PDF malware analysis — malicious · 7caf0820225ad9c3

MALICIOUS

PDF

13.3 KB

MD5: 1206319bee5c3f6f838edecd9596ac47 SHA-1: de64b370c89efd3e98de4b4ca01f51cc8c0cae1d SHA-256: 7caf0820225ad9c3019e6f8863eb95045bee3a7e9ed6713415a9c657f162e4e4

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript that is obfuscated using binary-XOR encoding. This script exploits the CVE-2007-5659 vulnerability in Adobe Reader via the Collab.collectEmailInfo method. The recovered JavaScript is designed to download and execute a second-stage payload, indicated by the 'PDF_BINARY_XOR_JS_STAGER' and 'CVE_2007_5659' heuristic firings. The ClamAV detection further confirms its malicious nature as Pdf.Dropper.Agent-7276068-0.

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-7276068-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7276068-0
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` `edeb5b08134a6edb90073d84de163a73e6e9ea2e2a64366ac7f09aa05469df3c`	pdf-javascript-stream	PDF /JS object 49 at offset 0xA	78952 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` `03b5794a7fbad6375b065f04b3bd8e6231376143a8cfff434a2b9735e8b545a9`	deobfuscated-js	binary-XOR decoded JavaScript at offset 0x464	1318 bytes

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