PDF malware analysis — malicious · 19cfb04a84d8eb97

MALICIOUS

PDF

1.53 MB Created: 2008-01-05 16:25:50 +01:00 Authoring application: LaTeX with hyperref package (via pdfeTeX-1.21a)

MD5: 78b63de3d23b922cb95004c6e0bf3109 SHA-1: 4f85d6f1e4ffb4bf852e2ff40b56834e08003160 SHA-256: 19cfb04a84d8eb9766bd461c3809345ad1e1ee3ca8c58dfa5f2e9a5dfce56638

162 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains embedded JavaScript and a secondary embedded PDF, both flagged as suspicious. The ClamAV detection 'Pdf.Dropper.Agent-7234694-0' strongly indicates a dropper functionality. The presence of JavaScript and a child PDF suggests a multi-stage attack designed to download and execute further malicious content.

Heuristics 9

U3D/3D content in PDF — Adobe Reader 3D parser CVE-family indicator high CVE related PDF_U3D_CVE_RELATED

PDF contains U3D (Universal 3D) or 3D annotation content — CVE-2011-2462 and CVE-2009-3953 are critical vulnerabilities in Adobe Reader's U3D processing that allow arbitrary code execution. U3D content in PDFs is extremely rare in normal documents.
ClamAV: Pdf.Dropper.Agent-7234694-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7234694-0
Secondary embedded PDF body has suspicious static findings high POLYGLOT_CHILD_PDF_STATIC_TRIAGE

A valid PDF body was found at a nonzero offset inside another container and its carved contents matched PDF exploit or lure heuristics. This catches polyglots where the top-level magic routes to ZIP/OLE while a PDF reader or downstream parser opens the hidden PDF payload.
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.
External URI info PDF_URI

PDF contains an external URL action
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://vcg.isti.cnr.it
- http://meshlab.sourceforge.net

Extracted artifacts 7

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0048_000.js` `5942b382160e4a4fbd2c00392e14ee5af84c10fbd684bf5ef8fc042b099b20b4`	pdf-javascript-stream	PDF /JS object 48 at offset 0x32039	8192 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s).
`stream_000_off000002ad.bin` `b1f937b9541d599e1c6000c4c47f7f3f21a4d9b0e1051c8a5580e07bc6106afd`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x2AD	177792 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.72, consistent with packed or encrypted content.
`font_00_type1_off0002ac27.bin` `d129a586d7449f3004ab2629e1b01753002037f8ca955d68339aba6fea13d9dd`	pdf-font-stream	PDF embedded font (type1) at offset 0x2AC27	6428 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.55, consistent with packed or encrypted content.
`font_01_type1_off0002c3ce.bin` `6d68a200ddadd677e7031f9795a017ce42b4d7f02b68d39a072ecbc1e20fb5d6`	pdf-font-stream	PDF embedded font (type1) at offset 0x2C3CE	7849 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.64, consistent with packed or encrypted content.
`font_02_type1_off0002e1fc.bin` `f1d06dc0327817e03d778a88f65436557134c269106fbc5438dd4ef0c897a441`	pdf-font-stream	PDF embedded font (type1) at offset 0x2E1FC	11287 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.76, consistent with packed or encrypted content.
`font_03_type1_off00030c39.bin` `cab7a46a0f2b73639fc37aa221b515da6888b096748ee89dec2f4876e25f7f1f`	pdf-font-stream	PDF embedded font (type1) at offset 0x30C39	2374 bytes
`polyglot_child_pdf_off00043cdd.pdf` `0c928c2a4a5586bb7f7541102a0c4d756ee7798dc644b09be04eaa768974a664`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0x43CDD	1322533 bytes

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