PDF malware analysis — malicious · 814cd5d5a013a18d

MALICIOUS

PDF

646.1 KB Created: 2008-02-27 16:58:09 +08:00 Authoring application: PScript5.dll Version 5.2 (via Acrobat Distiller 6.0.1 (Windows))

MD5: bc5cf40afbf74342c15df1baad211e43 SHA-1: f7b558741503ba6f29af114cfd660ef19f88d054 SHA-256: 814cd5d5a013a18dc43f77a61e49decb3c6847e2fa08974704c365f4fb209e92

254 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.001 Malicious Link T1204.002 Malicious File

The PDF file contains embedded JavaScript and triggers a critical heuristic for CVE-2007-5659 (Collab.collectEmailInfo). This indicates the document is designed to exploit this vulnerability to gather user email information. The presence of an extracted JavaScript file and ClamAV detections further support its malicious nature as a dropper or exploit delivery mechanism.

Heuristics 10

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.Dropper-82 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Trojan.Dropper-82
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.
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
XFA form low PDF_XFA

PDF uses XML Forms Architecture — can contain script logic
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.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://www.w3.org/1999/xhtml
- http://www.xfa.org/schema/xfa-data/1.0/
- http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://ns.adobe.com/iX/1.0/
- http://ns.adobe.com/pdf/1.3/
- http://ns.adobe.com/xap/1.0/
- http://ns.adobe.com/xap/1.0/mm/
- http://purl.org/dc/elements/1.1/

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0017_000.js` `a855e1484b6aa802ce0f6f936ba6d5b5bb5556ec34d1f510cb7f17c768fa4311`	pdf-javascript-stream	PDF /JS object 17 at offset 0x676	4622 bytes
Detection ClamAV: Win.Trojan.Dropper-82 Obfuscation or payload: likely Carved artifact contains 16 eval/decoder/string-building token(s).
`font_00_cff_off0008530b.bin` `6f7d0254022174ff25d1f2137848b1be40a16587d2f8650e91efba0e4796e553`	pdf-font-stream	PDF embedded font (cff) at offset 0x8530B	2312 bytes
`font_01_sfnt_off00085f97.bin` `6cddcdd51335767d4015d31283ea21cea48097d60535b29e16634c1656b05874`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x85F97	53805 bytes
`font_02_cff_off0008d4d7.bin` `e718e3a999849e922c215d1559efa77ce32ef8b1512401783e739efd9d2cc5a3`	pdf-font-stream	PDF embedded font (cff) at offset 0x8D4D7	885 bytes

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