PDF malware analysis — malicious · b723b2adb1ec986d

MALICIOUS

PDF

9.3 KB

MD5: 0d2e3c1eec07af4ccc30ec96e1e8acb3 SHA-1: 736e9e5da29dd7521f4a96f75cd82dbbd7539e77 SHA-256: b723b2adb1ec986df6d6e8e4c38b2e8fb3b0e43bdd720b9bb6ca3bbd426a252a

208 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The critical heuristic firing for CVE-2007-5659 indicates the exploitation of a known vulnerability in PDF handling. The presence of embedded JavaScript, further highlighted by the PDF_JAVASCRIPT and PDF_JS heuristics, suggests that the exploit is used to execute malicious code. The deobfuscated JavaScript streams are substantial, implying complex malicious functionality, likely involving the download and execution of a second-stage payload. The ClamAV detection and ML classifier further corroborate the malicious nature of this PDF.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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` `ad5d241d0c1b3ed0e612eb2d855354e2182c00a626be1a8ae99e737b434dd4cc`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	11817 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` `f69e720f91ea9e6b9e541134b5357bd4b243ba8109075a3b5f3fd0399a104cb2`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	4948 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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