Malicious PDF — malware analysis report

Static analysis result for SHA-256 29157e6f7f66bd3b…

MALICIOUS

PDF

10.5 KB First seen: 2013-09-08
MD5: 5ed82f809d23ddefa04e6aff6f4562c5 SHA-1: e0bfc7a05c794fc054da2bac2bd937006895fc8e SHA-256: 29157e6f7f66bd3bf877492a284c2450da21e35872102ae452200ba4c6ee5e98
80 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file exhibits multiple indicators of malicious intent, including embedded files and a script payload. The presence of an AcroForm button with an action trigger and embedded files points towards an attempt to execute code or download further malicious content. The embedded URL, while seemingly benign, is part of the overall structure that facilitates the execution of embedded scripts.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 7

  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • Embedded script payload in PDF stream info PDF_EMBEDDED_SCRIPT_PAYLOAD
    PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
  • 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.xfa.org/schema/xfa-locale-set/2.1/ In PDF document text
    • http://ns.adobe.com/xdp/In PDF document text
    • http://www.xfa.org/schema/xci/1.0/In PDF document text
    • http://www.xfa.org/schema/xfa-data/1.0/In PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0041.bin pdf-embedded-file PDF EmbeddedFile object 41 at offset 0xB03 85 bytes
SHA-256: c06dcd026a7ea0536b63e07ce688691b585339a3ab7ff59065e546b56308c7bb
embedded_file_obj0042.bin pdf-embedded-file PDF EmbeddedFile object 42 at offset 0xBB5 1029 bytes
SHA-256: dda0835df994b8be920f715db36452f6cee7bb42bbc9c897f878a7b298ba8e91
embedded_file_obj0121.bin pdf-embedded-file PDF EmbeddedFile object 121 at offset 0xDCF 72213 bytes
SHA-256: 3470483e96780ea02334b5f300a64baaeefde1a5510cf305be3f6fc17af6987c
Detection
ClamAV: No threats found
Obfuscation or payload: likely
39 of 63 identifiers look randomly generated (e.g. 'zYIWnFMceWIpccMYgrcuSqehLsr'); 17 string-concatenation chain(s) — consistent with name-mangling obfuscation.
embedded_file_obj0044.bin pdf-embedded-file PDF EmbeddedFile object 44 at offset 0x24C5 144 bytes
SHA-256: 3dd68f00f4fcb366a2a3a17c65cb2626eeddf5ea5713302d374310561d810169
embedded_file_obj0045.bin pdf-embedded-file PDF EmbeddedFile object 45 at offset 0x2572 77 bytes
SHA-256: 10c03f88a5f0a0833dc5b2c8ac295b3a3c6f65e23889eb8cc1dc6fe29bf7f275

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