PDF malware analysis — malicious · 3d031462257923bf

MALICIOUS

PDF

5.9 KB Created: 0312-12-35 50:76:90 -63:79 Authoring application: Acrobat Editor 8.0 (via Adobe Acrobat 8.1.0)

MD5: 0fe3e841ea37027042c6d11aea3cb233 SHA-1: f13f732d175925b85db3e1b90a5ac47c4f3c9a8f SHA-256: 3d031462257923bf23c08a9ed172a94fe8678bea2a0f477b6c65c0dd8addb61c

246 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript that utilizes the `eval()` function and `String.fromCharCode()`, indicating obfuscated code execution. The critical heuristic `CVE_2007_5659` specifically identifies the use of `Collab.collectEmailInfo` to exploit a known vulnerability in Adobe Reader, leading to the execution of a second-stage payload. ClamAV also detected this file as `Pdf.Exploit.Agent-35551`. The embedded JavaScript is heavily obfuscated, but the exploit mechanism is clear.

Heuristics 9

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.
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/1999/02/22-rdf-syntax-ns#
- http://ns.adobe.com/xap/1.0/
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/pdf/1.3/

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0028_000.js` `ddbc363137990cf63f6e17aff5501f83a466c75bc363dd8f9100ad56ae605053`	pdf-javascript-stream	PDF /JS object 28 at offset 0x544	3831 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` `8443ce093772709cfa37d2f7a87f2182adf6209540e94206e8fda0bccbceb9ef`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x8E3	2213 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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