PDF malware analysis — malicious · 971c267c7fca3758

MALICIOUS

PDF

11.5 KB

MD5: df1c0ee4d755d22a772d6044d2d6f9b9 SHA-1: 836ec03704b7377fb663be599eadf3ea8a21bcce SHA-256: 971c267c7fca3758b269d9e2a399d6573fb8cd9049d5592d10c9c71256ba1a7c

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. The critical CVE_2007_5659 heuristic indicates the use of the Collab.collectEmailInfo method to exploit a known vulnerability. This JavaScript is likely responsible for downloading and executing a second-stage payload, as suggested by the suspicious extracted JavaScript artifacts. The file is detected by ClamAV as Pdf.Exploit.Agent-36079.

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` `ccc1ceb8e8bc2b470e3693c2945e4c5754d6147e9dd00b1090a0844ffedaffcd`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x36F	11998 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `58ad57b9b9cd273d21db6c946c7211a07becd2537f5dc29dd7f73575f2c39c49`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x36F	4873 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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