PDF malware analysis — malicious · e5f29bc0de63271c

MALICIOUS

PDF

13.3 KB

MD5: 9c91a07ba382a28f976a15492b595980 SHA-1: 99fd0b725eab13e9791573aff2148e45bbb6b375 SHA-256: e5f29bc0de63271c4a8182fd9fcd5920d68c277388f3bea46a7dbed55b472157

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains obfuscated JavaScript that utilizes the Collab.collectEmailInfo method to exploit CVE-2007-5659 in Adobe Reader. The JavaScript is further obfuscated using binary-XOR encoding, indicating a deliberate attempt to hide its malicious functionality. The primary goal appears to be the execution of a second-stage payload via this exploit.

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: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
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` `cf9764e1225f41c7c37cadfb19d448a2b7a10e30fecd872a57337aa929f9d1b6`	pdf-javascript-stream	PDF /JS object 49 at offset 0xA	79132 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` `f52cec7a34940b34d2bb0e90019cc98fb82dfd4e0982eaed941bd278714e19f9`	deobfuscated-js	binary-XOR decoded JavaScript at offset 0x3F8	1324 bytes

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