PDF malware analysis — malicious · dae7569cd622f426

MALICIOUS

PDF

13.3 KB

MD5: c6aa9ef944b03da2d356a33331e03708 SHA-1: b7c451d707220961a6e39906e02602c5c49fb2e4 SHA-256: dae7569cd622f426babcd7b78fbbccf8634b9224410ef54bd38de259045e253a

188 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains a critical heuristic firing for CVE-2007-5659, indicating exploitation of a vulnerability in Adobe Reader's Collab.collectEmailInfo function. A binary-XOR JavaScript stager was recovered, which is designed to decode and execute further malicious JavaScript. This stager is responsible for downloading and executing a second-stage payload, as indicated by the PDF_BINARY_XOR_JS_STAGER and CVE_2007_5659 heuristics.

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-7311945-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7311945-0
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.
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` `603849c3dc1d26885dfc30a401d1efaf0749d1352a415d452ea520c1f306faa6`	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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