PDF malware analysis — malicious · ac242dc3697621d4

MALICIOUS

PDF

9.6 KB

MD5: c435af25c7a7c4f3756e9c809a05f0f5 SHA-1: d827c4c8e3329487fac0a5f44849eb8eca7bc431 SHA-256: ac242dc3697621d48a8f5114951c53ac656452bcf10ba8ba729525601698dfb2

178 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript that is obfuscated and uses the unescape() function, indicating malicious intent. The critical heuristic CVE_2007_5659 specifically points to the exploitation of this known vulnerability. The embedded JavaScript is likely designed to download and execute a second-stage payload, as suggested by the ClamAV detection and the nature of the exploit.

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` `80a90e197249f19928e9bc947ed1e2695ca51215aa7a5f534b6f3bf8648a4926`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	12440 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` `70f15f01490aa584a7c5fc8a015e8691d1b00e097708ff1a4d0fb2cfde266bf8`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	5251 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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