PDF malware analysis — malicious · ab7308a54bdc0ce6

MALICIOUS

PDF

9.5 KB

MD5: 4142405757e6668953bce900d1a72e2a SHA-1: 1e6b01b710fe336671ac2184c4f14b01d3f1e3e7 SHA-256: ab7308a54bdc0ce69ba36cb0a4d1daeede98923982038bea54001043e6270d08

178 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The file is a PDF containing embedded JavaScript, which is flagged as malicious by ClamAV (Pdf.Exploit.Agent-35905). The critical heuristic CVE_2007_5659 indicates exploitation of a known vulnerability related to the Collab.collectEmailInfo function, which is used to launch JavaScript. The JavaScript is heavily obfuscated, but the presence of unescape() calls and the overall structure suggest it's designed to download and execute a second-stage payload. The PDF launcher concatenates info fields and extracts characters at a fixed stride, then evaluates the result, confirming the exploit's execution path.

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` `b356d892f7a231ca14fe8832215295c1f79744a6ddb17282a0e69ad81862e471`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	12183 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` `8a121b68ae1f058e3a14b1105362de902f7c90efe859f3f39579e0aeda8efab9`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	5059 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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