PDF malware analysis — malicious · 78ed2d51e507dabe

MALICIOUS

PDF

75.9 KB

MD5: 0a0897fa7aefc959d76b39c858648a32 SHA-1: f794e07af43966e7cecd156063085c38fc416266 SHA-256: 78ed2d51e507dabefc4b8b060121849f79a6c61c3cedd3d0bb0d7cb2ad1d0af6

316 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains JavaScript that is obfuscated using binary-XOR encoding and string concatenation. This script leverages the CVE-2007-5659 vulnerability (Collab.collectEmailInfo) to execute further malicious code. The primary function of the script is to decode and execute a second-stage payload, acting as a dropper.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 9

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)
PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
ClamAV: Pdf.Dropper.Agent-7274772-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7274772-0
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0004_000.js` `26cdac1be01802afc690e292d1cd7c8ae3ccfe7ad9646a2b9d093602941fafd9`	pdf-javascript-stream	PDF /JS object 4 at offset 0xC0	77434 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).
`javascript_obj0004_001.js` `0bed56cc1cc05534d53385bef79c058c155407a838d06b919dc8f76447faa0ca`	pdf-javascript-stream	PDF /JS object 4 at offset 0xE3	77545 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` `15fd3aaa4b8bcd957e7d4dd3c6d0ba15018596f709b0920d4e67bd4b19093813`	deobfuscated-js	binary-XOR decoded JavaScript at offset 0x3D7	1267 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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