PDF malware analysis — malicious · 1c036a5d71c1eab3

MALICIOUS

PDF

2.8 KB Created: 2008-08-06 01:42:27 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: 4d49957432e6fc4785403a01f664b2ce SHA-1: 984cbc75c569bfa000dd218d06822281e1404f30 SHA-256: 1c036a5d71c1eab3bd46493e1d8e9aadde95b239acb18490a7a27fcbed888fe0

316 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript triggered by an OpenAction, which is a common technique for exploiting PDF vulnerabilities. The heuristic CVE_2007_5659 specifically points to the Collab.collectEmailInfo vulnerability. The embedded JavaScript stream, identified as 'javascript_obj0013_001.js', is highly suspicious and likely responsible for downloading and executing a secondary payload, as indicated by the ClamAV detection of 'Win.Trojan.Agent-34667' on both the original PDF and the extracted artifact. The use of JavaScript within a PDF document to trigger malicious actions aligns with common attack patterns for this file type.

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. (matched in decompressed stream)
ClamAV: Win.Trojan.Agent-34667 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Trojan.Agent-34667
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.
OpenAction trigger high PDF_OPENACTION

PDF has an /OpenAction — code runs automatically when opened
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
Suspicious extracted artifact high 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.
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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_001.js` `27fab927e92ed958457cab72a8df0097e085e5247b7dc30e0681a7cbe857906b`	pdf-javascript-stream	PDF /JS object 13 at offset 0x366	2802 bytes
Detection ClamAV: Win.Trojan.Agent-34667 Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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