PDF malware analysis — malicious · a8e10256d5f27677

MALICIOUS

PDF

11.6 KB

MD5: cdbe5857eecc5903d07c1decb02c5bde SHA-1: 6d1f4cd8b6c2283604971a4fd0e093dc44929387 SHA-256: a8e10256d5f27677b384242c0af8772ec2ff59a67da59984c9f6e45a38ff1dde

146 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.001 Malicious Link/Object T1059.007 JavaScript/JScript

The PDF file contains embedded JavaScript that leverages the CVE-2007-5659 vulnerability through the 'collab.collectEmailInfo' method. This technique is commonly used to bypass PDF security features and execute arbitrary code. The embedded JavaScript is heavily obfuscated but appears to be designed to download and execute a second-stage payload. The ClamAV detection further supports the malicious nature of the file.

Heuristics 6

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-36079 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36079
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `ef8bdac794684ae9cd4eb7091d80e1c5ca478c06c639d72d01626c1f7ce78b6d`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19C	578 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `8bf17c62bd52b96e07d26bfc1741b43590730ccb5f6e8e039c53ffe5ef7a65c0`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x36F	12040 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `37e842a18e862174a800e7f247f02736eef351aa6233548f4af4389c021a9876`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x36F	4886 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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