PDF malware analysis — malicious · 1cf258f1f73ba530

MALICIOUS

PDF

12.0 KB

MD5: b2bc686fb9cb3ee3c5cc5f3ff56e7ba6 SHA-1: d0bdfd56f63bcd1cd4fe505f3759d2a6290ae884 SHA-256: 1cf258f1f73ba530575e95eb7613a135c152cbb09dd5422faffabee19f3f10f1

146 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript that exploits the CVE-2007-5659 vulnerability. The JavaScript is obfuscated and uses String.fromCharCode to decode its payload. The heuristic firings indicate the presence of JavaScript actions and embedded JS streams, specifically leveraging the Collab.collectEmailInfo method, which is characteristic of this exploit. 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` `7f2f44d4a694e02158dfe4f2eb3c5994c2e1f0ab6b580d5ee2b487d4b8df0630`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x36F	12456 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `f88547d589e8aa6b596220e3e6b494587b40b3624e9e33ddb51b232357090cdd`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x36F	5126 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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