PDF malware analysis — malicious · 4b87ec64d9dc6a3f

MALICIOUS

PDF

129.8 KB

MD5: b9c33cf14c7fb76d1d0f8d25d6fdcfe2 SHA-1: 054d615a3bb288fb7be1e23d6477fc2ee3356e51 SHA-256: 4b87ec64d9dc6a3f24e62b357283ba7a3ea4fa5be7ca416eb8dda19d2c88f429

318 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1204.002 Malicious File

This PDF file is malicious, as indicated by multiple critical heuristic firings related to known Adobe Reader exploits (CVE-2009-0927, CVE-2007-5659, CVE-2008-2992). The embedded JavaScript, identified as legacy_pdfkit_stage_000.js, is likely responsible for triggering these vulnerabilities. ClamAV detections further confirm its malicious nature. The primary attack vector appears to be exploiting these specific CVEs to achieve arbitrary code execution, likely for downloading and executing further malicious content.

Heuristics 8

Collab.getIcon — CVE-2009-0927 critical CVE exact CVE_2009_0927

PDF JavaScript calls Collab.getIcon — CVE-2009-0927 is a stack buffer overflow in Adobe Reader triggered by Collab.getIcon() with a crafted argument. Allows arbitrary code execution. (identified after JavaScript deobfuscation)
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)
util.printf — CVE-2008-2992 critical CVE exact CVE_2008_2992

PDF JavaScript calls util.printf() — CVE-2008-2992 is a stack buffer overflow in Adobe Reader triggered by a long format-specifier argument. Widely exploited in the wild after disclosure. (identified after JavaScript deobfuscation)
ClamAV: Pdf.Exploit.Agent-36307 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36307
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
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.
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0008_000.js` `f0637df536f2fcba901801dcaec918d4c121f345cc1eb6647c0f938162dd1e1b`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	5372 bytes
Detection ClamAV: Pdf.Exploit.Agent-36307 Obfuscation or payload: unlikely
`legacy_pdfkit_stage_000.js` `4463970894ff42e35421afe2587a459ec357e7857d05500984ab89e877ecd53f`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1717	6032 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 11 eval/decoder/string-building token(s).

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