PDF malware analysis — malicious · ec5d1ecfd2aa6a99

MALICIOUS

PDF

4.7 KB Created: 2002-03-27 12:02:13 Authoring application: Aladdin Ghostscript 5.10

MD5: ac97b243bdda63ec7f6cde4ee6728ced SHA-1: 33d4633f04fd7f55d68f2a50ff1dda6accbcc42c SHA-256: ec5d1ecfd2aa6a9908ee29985cf0b0fee038ba1550986d340e53aaf40f4a65ea

238 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1566.001 Spearphishing Attachment T1204.001 Malicious Link

The sample is a PDF file that triggers a critical vulnerability (CVE-2007-5659) related to the Collab.collectEmailInfo function. This vulnerability is known to be exploited via embedded JavaScript. The presence of an embedded JavaScript stream and a critical heuristic firing for this CVE strongly suggests the document is designed to exploit this flaw. The extracted artifact 'javascript_obj0012_000.js' is likely the payload. The ClamAV detection further confirms its malicious nature.

Heuristics 7

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. (matched in decompressed stream)
ClamAV: Win.Trojan.Agent-36171 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Trojan.Agent-36171
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.
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0012_000.js` `8f9feb04635fd0e86ab678734b3405511fd89b26c461db923d66384934ce0f0f`	pdf-javascript-stream	PDF /JS object 12 at offset 0xCDF	1688 bytes
Detection ClamAV: Win.Trojan.Agent-36171 Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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