PDF malware analysis — malicious · 5358777f8973b154

MALICIOUS

PDF

11.8 KB

MD5: d9a43dd2b5c3c58d83ed40b580f9b005 SHA-1: 5bc3c62cdcb1a307dfed7e54a825e3573b291b5f SHA-256: 5358777f8973b154514c3032fcaa4132fe56e1adab98bac7372fe622761a9437

146 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious Link

The file is a PDF containing embedded JavaScript, which is known to be used for exploiting vulnerabilities. Specifically, the 'CVE_2007_5659' heuristic indicates the use of the Collab.collectEmailInfo method, a known exploit vector. The embedded JavaScript streams, particularly 'legacy_pdfkit_stage_000.js', are likely responsible for executing the exploit. The ClamAV detection further confirms its malicious nature. The exact payload or ultimate goal is not clear from the provided evidence, but the exploit mechanism is evident.

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` `eb94dc4cee5534f738c2916407eb20c267637e62aa1b0a1b595c2ac42c308099`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x36F	12372 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `0e22f009e1191b3791658e34ae69d23cc913c28ade42a3953441fdfaf98cbe6d`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x36F	5083 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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