PDF malware analysis — malicious · b3fca16c2655d5c2

MALICIOUS

PDF

13.2 KB

MD5: 37178df2225b12bd7fe14f59caf7165b SHA-1: bcb7fca910924a836d0fb0d7fcf1c515d5eea400 SHA-256: b3fca16c2655d5c2599f2fa76825bba29437a31c06ce5f5807b9cfa81461f384

186 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript that is obfuscated using binary-XOR encoding. This script exploits CVE-2007-5659 (Collab.collectEmailInfo) to download and execute a second-stage payload. The ClamAV detection name 'Pdf.Dropper.Agent-7294844-0' further confirms its malicious nature as a dropper.

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-7294844-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7294844-0
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` `9f0a1f3e6b304be49835bb1de036bf39d39dcf3177752a8a678673b4095e754f`	pdf-javascript-stream	PDF /JS object 49 at offset 0xA	78556 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` `4fd1de754d5cbfb13325d7f641b85a861dd4e60a490ccd6733c27a708ccefc92`	deobfuscated-js	binary-XOR decoded JavaScript at offset 0x3F8	1312 bytes

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