PDF malware analysis — malicious · 3d79bf528853b88c

MALICIOUS

PDF

13.0 KB

MD5: a60983b7a51a51f4f25c5e55786f87a6 SHA-1: 16fb77333d7f140291a5e6feba2faf5e44bc10c8 SHA-256: 3d79bf528853b88cc9e57763c619cc5509db4ae9be71df0ae73407692801184a

138 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT' and 'PDF_JS'. The critical CVE-2007-5659 heuristic specifically points to the use of 'Collab.collectEmailInfo' for executing JavaScript, a known technique for exploiting PDF vulnerabilities. The presence of deobfuscated JavaScript files ('legacy_pdfkit_stage_000.js', 'legacy_pdfkit_stage_001.js') further supports this. The ClamAV detection 'Pdf.Exploit.Agent-36064' confirms its malicious nature. The script's likely intent is to download and execute a second-stage payload.

Heuristics 5

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-36064 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36064
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `a5c8f0f722df4dd9876a0087e1eee65bd3020c5995f94f6729f7e17f3f3677a0`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19D	331 bytes
`legacy_pdfkit_stage_000.js` `aeb14689420a0393e512d9a90dfd35782e8e384d4709361c58919e3f50af102d`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F2	12088 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `d9af2a51eb3fa84e3e517c757956ecbf08930eea1d72032132492c3d640d00c7`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F2	4997 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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