PDF malware analysis — malicious · 752a7777ae5b218f

MALICIOUS

PDF

11.8 KB

MD5: dfd573a517d82dc3ab44be2011c26ac3 SHA-1: cf2d3fbedc4904df4f8523e259cd40be0adad9f1 SHA-256: 752a7777ae5b218fd4eb84e8664f546558f7d8df7dc23d019bbb6845ca04c4ed

146 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, identified by multiple heuristics including 'PDF_JAVASCRIPT' and 'PDF_JS'. A critical heuristic, 'CVE_2007_5659', specifically indicates the use of the Collab.collectEmailInfo method to exploit CVE-2007-5659. This exploit likely involves JavaScript that concatenates strings, extracts characters, and evaluates the result, a common technique for downloading and executing further malicious content. The presence of deobfuscated JavaScript streams further supports this. The ClamAV detection 'Pdf.Exploit.Agent-36079' confirms the malicious nature.

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` `ae946bee5d40fdda3a17abada2cee14ca357b812ae8f08463b306f6ef07f2dd0`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x36F	12278 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `8b686a47725efb33dc21b6e8a05c1f83302cde9fa685a6370e7e40124ba8d7c0`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x36F	5023 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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