PDF malware analysis — malicious · 83fa4de54e4b0020

MALICIOUS

PDF

36.7 KB Created: 2010-06-10 23:08:24 Authoring application: Advanced PDF Repair at http://www.datanumen.com/apdfr/

MD5: bbfa8bdd2ed641e531ac1f40e4708928 SHA-1: ae979d8ec13fc525bcfce3838cad75f24fd2be76 SHA-256: 83fa4de54e4b002089400c74d52463fc156fe374e478df62bc33e93b9a92bd7d

188 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as 'Pdf.Exploit.Agent-35955'. It contains embedded JavaScript and a Flash object (pad.swf), indicating a multi-stage attack. The JavaScript stream is likely responsible for executing the exploit or downloading additional payloads. The presence of these embedded objects strongly suggests an attempt to compromise the user's system.

Heuristics 9

ClamAV: Pdf.Exploit.Agent-35955 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35955
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.
RichMedia (Flash) high PDF_RICHMEDIA

PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector
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
PDF paints image(s) but contains no text operators info PDF_IMAGE_ONLY_LURE

PDF has 2 image XObject(s) and the content stream contains no text-emitting operators (BT/ET, Tj, TJ, ', ") in either raw bytes or decompressed streams — this is the screenshot-as-PDF pattern used to bypass text-based scanners and to deliver instructions purely through rendered pixels. It is informational unless paired with invisible links or risky URI context.
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.datanumen.com/apdfr/

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`pad.swf` `c8a20e8ded0e5fe8a6a5cddff2408ac7f8a83df3f18abea5748cc817f3a3ebb9`	pdf-embedded-file	PDF EmbeddedFile object 27 at offset 0x2326	26810 bytes
Detection ClamAV: Pdf.Exploit.Agent-35955 Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.
`javascript_obj0005_000.js` `ef43794a98a85645849874ec86e690806d607718c74f7368956f691ef3241550`	pdf-javascript-stream	PDF /JS object 5 at offset 0x366	4201 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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