PDF malware analysis — malicious · 9f3eff75fb927ea4

MALICIOUS

PDF

12.9 KB

MD5: 686bf87bee4152d956cae8f1fc9e885e SHA-1: a6f9ec324d2235f9abbcacdf5c1641a37e012992 SHA-256: 9f3eff75fb927ea4d1da9af1fecd03637bc0b22fd4c15a59451b7cd4fd4436dd

216 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains a JavaScript stager that is obfuscated using binary-XOR encoding. This stager exploits CVE-2007-5659 by leveraging the Collab.collectEmailInfo method. The recovered JavaScript is designed to download and execute a second-stage payload, indicating a dropper functionality. The presence of PDF-specific heuristics and the nature of the exploit strongly suggest a malicious intent.

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-7287637-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7287637-0
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.
String.fromCharCode medium PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically (matched inside decoded stream)
Suspicious extracted artifact medium 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.
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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0049_000.js` `200e72410ffd9408ed6a873199ccbbd11a859866d4cd5969f7d2f5cc69dd17ff`	pdf-javascript-stream	PDF /JS object 49 at offset 0xA	76828 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` `781fd6e893f2242a2977e7fdba7de2aa2f4bf59122e6526aa7cb988978231720`	deobfuscated-js	binary-XOR decoded JavaScript at offset 0x3F8	1276 bytes

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