PDF malware analysis — malicious · 5e10d13126b0569d

MALICIOUS

PDF

400.0 KB Created: 2012-07-24 11:18:21 +08:00

MD5: b87830c02fa21676af9aae42d870a5a8 SHA-1: 346ff0869e8cf550a95c4b2f603314e2439660fb SHA-256: 5e10d13126b0569dddebea0e4293c94137b01e5bfb1425f5256e0a961da0c736

246 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF exhibits multiple critical heuristic firings, including ML classification, ClamAV detection (Pdf.Dropper.Agent-1507076), and detection of a suspicious secondary embedded PDF. The presence of JBIG2 decoding, RichMedia (Flash) content, and ASCIIHexDecode filters suggests an attempt to hide malicious content or exploit vulnerabilities. The file's structure and embedded artifacts strongly indicate it's designed to execute malicious code or download further stages.

Machine Learning

Nyx PDF Classifier malicious score 0.5508

Heuristics 10

Secondary embedded PDF body has suspicious static findings critical 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.
ClamAV: Pdf.Dropper.Agent-1507076 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-1507076
RichMedia (Flash) high PDF_RICHMEDIA

PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector (matched inside decoded stream)
JBIG2Decode filter medium PDF_JBIG2

JBIG2 image decoder present — historically used in zero-click exploits
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload (matched inside decoded stream)
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
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.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 6

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objstm_0027_00.bin` `fbf521f15b901d620bc41b45f37251c8f37f29210f70f3cf3c9f553358f9a689`	pdf-objstm-decoded	PDF /ObjStm 27 0 obj (inflated)	1178 bytes
`objstm_0027_00_1.bin` `cbe7057ff08cb812a985de689a0104a0841503ddc4fca44f98d1b7db4e212852`	pdf-objstm-decoded	PDF /ObjStm 27 0 obj (inflated)	1178 bytes
`jbig2_00_off00023dc7.bin` `7be6325c5e2788d5ba2290db0a4c3f5ac065c1b6628c543f690488281c8f9172`	pdf-jbig2-stream	PDF JBIG2 stream at offset 0x23DC7	43441 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 8.00, consistent with packed or encrypted content.
`polyglot_child_pdf_off0002122a.pdf` `61579d07714947bbde83806fb4cceb2b2cde925382dbcf19af8cbd39ff670c22`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0x2122A	273878 bytes
`polyglot_child_pdf_off0005322a.pdf` `374cba7ee357f1dae96c9457cabc7297a35b7086bad146a93e73380b46827326`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0x5322A	69078 bytes
`polyglot_child_pdf_off0005b407.pdf` `6eb72718b7f353bb6cc885867c9f0567f14a14bf0edf5b5fa28d7e89cf5d1921`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0x5B407	35833 bytes

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