PDF malware analysis — malicious · a217fe51205060bc

MALICIOUS

PDF

13.0 KB

MD5: c48f397a70f27446b5cfa5fcf87eb959 SHA-1: 274f9b52655177f82a124fd60856fbddb4e5e764 SHA-256: a217fe51205060bcc67269fde1da1585b0ee3cff5c6ae0ffd7a6f81782e1f177

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 CVE-2007-5659 by leveraging the Collab.collectEmailInfo function in Adobe Reader. The primary function of the script is to decode and execute a second-stage payload, acting as a dropper. The presence of the 'Pdf.Dropper.Agent-1828855' ClamAV signature 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-1828855 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-1828855
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` `566aa313f9e3985fb333ab015f11aea5315aa6d8b5e1dbe1cd92eac52912c00d`	pdf-javascript-stream	PDF /JS object 49 at offset 0xA	76936 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` `7a46468be9640c6c1267314496226c79be23fde5385d4c048846e3a61dc32822`	deobfuscated-js	binary-XOR decoded JavaScript at offset 0x464	1276 bytes

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