PDF malware analysis — malicious · b5111833fa443e8f

MALICIOUS

PDF

11.7 KB

MD5: 98266573036d498acd91c4b391ff685a SHA-1: 80010e184e792d01e7f2ef1cfb854e9fe8f30d25 SHA-256: b5111833fa443e8f3d4af13eb22ed214d9f3ca3eecbb6416067d2ca8aada1a1b

146 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT' and 'PDF_JS'. A critical heuristic identified the 'CVE-2007-5659' vulnerability, specifically related to the 'Collab.collectEmailInfo' function, which is used to execute obfuscated JavaScript. This JavaScript is likely responsible for downloading and executing a second-stage payload, as suggested by the presence of large extracted JavaScript files. The ClamAV detection 'Pdf.Exploit.Agent-36079' further confirms 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` `36387abdb39289dd5ad804da0a0057dc8abaa4e29c3086032729c5de699fae72`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x36F	12035 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `e5e5a85a77d0334883af5c9a88e1c49368728d600fde7f59aaf03a8714f2b4bb`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x36F	4939 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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