PDF malware analysis — malicious · c416fd064f1b40f2

MALICIOUS

PDF

3.6 KB Created: 2008-07-26 19:43:58 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: c7f4c148a94f902c3210b1b3039da8cf SHA-1: 69e255f8fc99e1bc15824d41686200846f45461b SHA-256: c416fd064f1b40f2a7bd7c917cdebf74a3c02499768904c3233136ba07db9d17

246 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 exploits CVE-2007-5659 (Collab.collectEmailInfo). The JavaScript is obfuscated and layered, with a custom Base64 decoder used to unpack the exploit stage. This exploit is designed to execute arbitrary code, likely leading to the download and execution of a second-stage payload. The ClamAV detection of 'Pdf.Exploit.Agent-35551' further confirms its malicious nature.

Heuristics 8

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-35551 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35551
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_000.js` `42c61717027fb824f2fe2bc6e589a0ca5ba42b1659fedde9aafce6216d38534c`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3CE	3887 bytes
Detection ClamAV: Pdf.Exploit.Agent-35551 Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`acroform_b64_00.js` `bfe9644d34927ba1a2c1dd51c28707757805ec380005d44052e164188d4a44c7`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x772	2254 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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