PDF malware analysis — malicious · b5dfc1871e41e723

MALICIOUS

PDF

9.3 KB

MD5: 968f5199af9fbb13a9785ca6489822bd SHA-1: 95db08560a59dccda2acc4cc24c5e557da3cc7bf SHA-256: b5dfc1871e41e723e8ab5a5bafb587920a4f52695f93ca2e380896febd037093

178 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. A critical heuristic identified the CVE-2007-5659 vulnerability, specifically related to the Collab.collectEmailInfo function, which is used to launch the embedded script. The script is heavily obfuscated but ultimately decodes to a large JavaScript payload. ClamAV also detected this as Pdf.Exploit.Agent-35905, confirming its malicious nature. The primary attack vector appears to be exploiting this CVE to execute arbitrary code.

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-35905 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35905
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
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` `d8a6b4ad1abf04d0c4a4f89535cfb57f7312edef25c443f4e844c8ec9d0929dd`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19B	352 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` `50866f2d6ef852856f88791e4544b5aa01d2eb816e8e24be41144ef4d9f9260c`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	11815 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `d4e9f58ac5e003eae1c0d254d277d04834a9d523039b395fbb2e6899a0cfae9a`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	4977 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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