PDF malware analysis — malicious · 393ec4f866411695

MALICIOUS

PDF

76.5 KB

MD5: 54667e5d9af4f4eca026b4a90f2d4b61 SHA-1: 9ae44bb07460577fdbfe2dc8597f1220d9839a24 SHA-256: 393ec4f866411695b6a5f8384ce0571113ad89be8ed2cdaeb96751d678683e70

226 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1204.002 Malicious File

The PDF file contains obfuscated JavaScript that utilizes the Collab.collectEmailInfo method, indicative of the CVE-2007-5659 exploit. The JavaScript is XOR-encoded and uses String.fromCharCode, further suggesting malicious intent. The primary goal appears to be exploiting Adobe Reader to download and execute a secondary payload, as indicated by the 'binary_xor_js_stager' heuristic.

Heuristics 8

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.Exploit.Agent-13199 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-13199
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0004_000.js` `cf089cf02c5743a8c79d0622a06d8d3a2e4bbc6fd700633ffe3b89ac69a7487f`	pdf-javascript-stream	PDF /JS object 4 at offset 0xC0	78010 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` `917ba7577903ac8dae9ca9258383ec500ee979df2b82480b8a9f01796bebe57b`	deobfuscated-js	binary-XOR decoded JavaScript at offset 0x3D7	1279 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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